SqlConnection.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Data / System / Data / SqlClient / SqlConnection.cs / 1305376 / SqlConnection.cs

                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
// [....]
//----------------------------------------------------------------------------- 
 
[assembly: System.Runtime.CompilerServices.InternalsVisibleTo("System.Data.DataSetExtensions, PublicKey="+AssemblyRef.EcmaPublicKeyFull)] // DevDiv Bugs 92166
[assembly: System.Runtime.CompilerServices.InternalsVisibleTo("System.Data.Entity, PublicKey="+AssemblyRef.EcmaPublicKeyFull)] // SQLPT 300000492 

namespace System.Data.SqlClient
{
    using System; 
    using System.Collections;
    using System.Configuration.Assemblies; 
    using System.ComponentModel; 
    using System.Data;
    using System.Data.Common; 
    using System.Data.ProviderBase;
    using System.Data.Sql;
    using System.Data.SqlTypes;
    using System.Diagnostics; 
    using System.Globalization;
    using System.IO; 
    using System.Runtime.CompilerServices; 
    using System.Runtime.ConstrainedExecution;
    using System.Runtime.InteropServices; 
    using System.Runtime.Remoting;
    using System.Runtime.Serialization.Formatters;
    using System.Text;
    using System.Threading; 
    using System.Security;
    using System.Security.Permissions; 
    using System.Reflection; 
    using System.Runtime.Versioning;
 
    using Microsoft.SqlServer.Server;

    [DefaultEvent("InfoMessage")]
    public sealed partial class SqlConnection: DbConnection, ICloneable { 

        static private readonly object EventInfoMessage = new object(); 
 
        private SqlDebugContext _sdc;   // SQL Debugging support
 
        private bool    _AsycCommandInProgress;

        // SQLStatistics support
        internal SqlStatistics _statistics; 
        private bool _collectstats;
 
        private bool _fireInfoMessageEventOnUserErrors; // False by default 

 
        public SqlConnection(string connectionString) : this() {
            ConnectionString = connectionString;
        }
 
        private SqlConnection(SqlConnection connection) { // Clone
            GC.SuppressFinalize(this); 
            CopyFrom(connection); 
        }
 
        //
        // PUBLIC PROPERTIES
        //
 
        // used to start/stop collection of statistics data and do verify the current state
        // 
        // devnote: start/stop should not performed using a property since it requires execution of code 
        //
        // start statistics 
        //  set the internal flag (_statisticsEnabled) to true.
        //  Create a new SqlStatistics object if not already there.
        //  connect the parser to the object.
        //  if there is no parser at this time we need to connect it after creation. 
        //
 
        [ 
        DefaultValue(false),
        ResCategoryAttribute(Res.DataCategory_Data), 
        ResDescriptionAttribute(Res.SqlConnection_StatisticsEnabled),
        ]
        public bool StatisticsEnabled {
            get { 
                return (_collectstats);
            } 
            set { 
                if (IsContextConnection) {
                    if (value) { 
                        throw SQL.NotAvailableOnContextConnection();
                    }
                }
                else { 
                    if (value) {
                        // start 
                        if (ConnectionState.Open == State) { 
                            if (null == _statistics) {
                                _statistics = new SqlStatistics(); 
                                ADP.TimerCurrent(out _statistics._openTimestamp);
                            }
                            // set statistics on the parser
                            // update timestamp; 
                            Debug.Assert(Parser != null, "Where's the parser?");
                            Parser.Statistics = _statistics; 
                        } 
                    }
                    else { 
                        // stop
                        if (null != _statistics) {
                            if (ConnectionState.Open == State) {
                                // remove statistics from parser 
                                // update timestamp;
                                TdsParser parser = Parser; 
                                Debug.Assert(parser != null, "Where's the parser?"); 
                                parser.Statistics = null;
                                ADP.TimerCurrent(out _statistics._closeTimestamp); 
                            }
                        }
                    }
                    this._collectstats = value; 
                }
            } 
        } 

        internal bool AsycCommandInProgress  { 
            get {
                return (_AsycCommandInProgress);
            }
            [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] 
            set {
                _AsycCommandInProgress = value; 
            } 
        }
 
        internal bool IsContextConnection {
            get {
                SqlConnectionString opt = (SqlConnectionString)ConnectionOptions;
                bool result = false; 
                if (null != opt) {
                    result = (opt.ContextConnection); 
                } 
                return result;
            } 
        }

        internal SqlConnectionString.TransactionBindingEnum TransactionBinding {
            get { 
                return ((SqlConnectionString)ConnectionOptions).TransactionBinding;
            } 
        } 

        internal SqlConnectionString.TypeSystem TypeSystem { 
            get {
                return ((SqlConnectionString)ConnectionOptions).TypeSystemVersion;
            }
        } 

        override protected DbProviderFactory DbProviderFactory { 
            get { 
                return SqlClientFactory.Instance;
            } 
        }

        [
        DefaultValue(""), 
#pragma warning disable 618 // ignore obsolete warning about RecommendedAsConfigurable to use SettingsBindableAttribute
        RecommendedAsConfigurable(true), 
#pragma warning restore 618 
        SettingsBindableAttribute(true),
        RefreshProperties(RefreshProperties.All), 
        ResCategoryAttribute(Res.DataCategory_Data),
        Editor("Microsoft.VSDesigner.Data.SQL.Design.SqlConnectionStringEditor, " + AssemblyRef.MicrosoftVSDesigner, "System.Drawing.Design.UITypeEditor, " + AssemblyRef.SystemDrawing),
        ResDescriptionAttribute(Res.SqlConnection_ConnectionString),
        ] 
        override public string ConnectionString {
            get { 
                return ConnectionString_Get(); 
            }
            set { 
                ConnectionString_Set(value);
            }
        }
 
        [
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), 
        ResDescriptionAttribute(Res.SqlConnection_ConnectionTimeout), 
        ]
        override public int ConnectionTimeout { 
            get {
                SqlConnectionString constr = (SqlConnectionString)ConnectionOptions;
                return ((null != constr) ? constr.ConnectTimeout : SqlConnectionString.DEFAULT.Connect_Timeout);
            } 
        }
 
        [ 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
        ResDescriptionAttribute(Res.SqlConnection_Database), 
        ]
        override public string Database {
            // if the connection is open, we need to ask the inner connection what it's
            // current catalog is because it may have gotten changed, otherwise we can 
            // just return what the connection string had.
            get { 
                SqlInternalConnection innerConnection = (InnerConnection as SqlInternalConnection); 
                string result;
 
                if (null != innerConnection) {
                    result = innerConnection.CurrentDatabase;
                }
                else { 
                    SqlConnectionString constr = (SqlConnectionString)ConnectionOptions;
                    result = ((null != constr) ? constr.InitialCatalog : SqlConnectionString.DEFAULT.Initial_Catalog); 
                } 
                return result;
            } 
        }

        [
        Browsable(true), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
        ResDescriptionAttribute(Res.SqlConnection_DataSource), 
        ] 
        override public string DataSource {
            get { 
                SqlInternalConnection innerConnection = (InnerConnection as SqlInternalConnection);
                string result;

                if (null != innerConnection) { 
                    result = innerConnection.CurrentDataSource;
                } 
                else { 
                    SqlConnectionString constr = (SqlConnectionString)ConnectionOptions;
                    result = ((null != constr) ? constr.DataSource : SqlConnectionString.DEFAULT.Data_Source); 
                }
                return result;
            }
        } 

        [ 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), 
        ResCategoryAttribute(Res.DataCategory_Data),
        ResDescriptionAttribute(Res.SqlConnection_PacketSize), 
        ]
        public int PacketSize {
            // if the connection is open, we need to ask the inner connection what it's
            // current packet size is because it may have gotten changed, otherwise we 
            // can just return what the connection string had.
            get { 
                if (IsContextConnection) { 
                    throw SQL.NotAvailableOnContextConnection();
                } 

                SqlInternalConnectionTds innerConnection = (InnerConnection as SqlInternalConnectionTds);
                int result;
 
                if (null != innerConnection) {
                    result = innerConnection.PacketSize; 
                } 
                else {
                    SqlConnectionString constr = (SqlConnectionString)ConnectionOptions; 
                    result = ((null != constr) ? constr.PacketSize : SqlConnectionString.DEFAULT.Packet_Size);
                }
                return result;
            } 
        }
 
        [ 
        Browsable(false),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), 
        ResDescriptionAttribute(Res.SqlConnection_ServerVersion),
        ]
        override public string ServerVersion {
            get { 
                return GetOpenConnection().ServerVersion;
            } 
        } 

        internal SqlStatistics Statistics { 
            get {
                return _statistics;
            }
        } 

        [ 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), 
        ResCategoryAttribute(Res.DataCategory_Data),
        ResDescriptionAttribute(Res.SqlConnection_WorkstationId), 
        ]
        public string WorkstationId {
            get {
                if (IsContextConnection) { 
                    throw SQL.NotAvailableOnContextConnection();
                } 
 
                // If not supplied by the user, the default value is the MachineName
                // Note: In Longhorn you'll be able to rename a machine without 
                // rebooting.  Therefore, don't cache this machine name.
                SqlConnectionString constr = (SqlConnectionString)ConnectionOptions;
                string result = ((null != constr) ? constr.WorkstationId : null);
                if (null == result) { 
                    // getting machine name requires Environment.Permission
                    // user must have that permission in order to retrieve this 
                    result = Environment.MachineName; 
                }
                return result; 
            }
        }

        // 
        // PUBLIC EVENTS
        // 
 
        [
        ResCategoryAttribute(Res.DataCategory_InfoMessage), 
        ResDescriptionAttribute(Res.DbConnection_InfoMessage),
        ]
        public event SqlInfoMessageEventHandler InfoMessage {
            add { 
                Events.AddHandler(EventInfoMessage, value);
            } 
            remove { 
                Events.RemoveHandler(EventInfoMessage, value);
            } 
        }

        public bool FireInfoMessageEventOnUserErrors {
            get { 
                return _fireInfoMessageEventOnUserErrors;
            } 
            set { 
                _fireInfoMessageEventOnUserErrors = value;
            } 
        }

        //
        // PUBLIC METHODS 
        //
 
        new public SqlTransaction BeginTransaction() { 
            // this is just a delegate. The actual method tracks executiontime
            return BeginTransaction(IsolationLevel.Unspecified, null); 
        }

        new public SqlTransaction BeginTransaction(IsolationLevel iso) {
            // this is just a delegate. The actual method tracks executiontime 
            return BeginTransaction(iso, null);
        } 
 
        public SqlTransaction BeginTransaction(string transactionName) {
                // Use transaction names only on the outermost pair of nested 
                // BEGIN...COMMIT or BEGIN...ROLLBACK statements.  Transaction names
                // are ignored for nested BEGIN's.  The only way to rollback a nested
                // transaction is to have a save point from a SAVE TRANSACTION call.
                return BeginTransaction(IsolationLevel.Unspecified, transactionName); 
        }
 
        public SqlTransaction BeginTransaction(IsolationLevel iso, string transactionName) { 
            SqlStatistics statistics = null;
            IntPtr hscp; 
            string xactName =  ADP.IsEmpty(transactionName)? "None" : transactionName;
            Bid.ScopeEnter(out hscp, " %d#, iso=%d{ds.IsolationLevel}, transactionName='%ls'\n", ObjectID, (int)iso,
                        xactName);
 
            try {
                statistics = SqlStatistics.StartTimer(Statistics); 
 
                // NOTE: we used to throw an exception if the transaction name was empty
                // (see MDAC 50292) but that was incorrect because we have a BeginTransaction 
                // method that doesn't have a transactionName argument.
                SqlTransaction transaction = GetOpenConnection().BeginSqlTransaction(iso, transactionName);

                // SQLBU 503873  The GetOpenConnection line above doesn't keep a ref on the outer connection (this), 
                //  and it could be collected before the inner connection can hook it to the transaction, resulting in
                //  a transaction with a null connection property.  Use GC.KeepAlive to ensure this doesn't happen. 
                GC.KeepAlive(this); 

                return transaction; 
            }
            finally {
                Bid.ScopeLeave(ref hscp);
                SqlStatistics.StopTimer(statistics); 
            }
        } 
 
        override public void ChangeDatabase(string database) {
            SqlStatistics statistics = null; 

            SNIHandle bestEffortCleanupTarget = null;
            RuntimeHelpers.PrepareConstrainedRegions();
            try { 
#if DEBUG
                TdsParser.ReliabilitySection tdsReliabilitySection = new TdsParser.ReliabilitySection(); 
 
                RuntimeHelpers.PrepareConstrainedRegions();
                try { 
                    tdsReliabilitySection.Start();
#else
                {
#endif //DEBUG 
                    bestEffortCleanupTarget = SqlInternalConnection.GetBestEffortCleanupTarget(this);
                    statistics = SqlStatistics.StartTimer(Statistics); 
                    InnerConnection.ChangeDatabase(database); 
                }
#if DEBUG 
                finally {
                    tdsReliabilitySection.Stop();
                }
#endif //DEBUG 
            }
            catch (System.OutOfMemoryException e) { 
                Abort(e); 
                throw;
            } 
            catch (System.StackOverflowException e) {
                Abort(e);
                throw;
            } 
            catch (System.Threading.ThreadAbortException e) {
                Abort(e); 
                SqlInternalConnection.BestEffortCleanup(bestEffortCleanupTarget); 
                throw;
            } 
            finally {
                SqlStatistics.StopTimer(statistics);
            }
        } 

        static public void ClearAllPools() { 
            (new SqlClientPermission(PermissionState.Unrestricted)).Demand(); 
            SqlConnectionFactory.SingletonInstance.ClearAllPools();
        } 

        static public void ClearPool(SqlConnection connection) {
            ADP.CheckArgumentNull(connection, "connection");
 
            DbConnectionOptions connectionOptions = connection.UserConnectionOptions;
            if (null != connectionOptions) { 
                connectionOptions.DemandPermission(); 
                if (connection.IsContextConnection) {
                    throw SQL.NotAvailableOnContextConnection(); 
                }
                SqlConnectionFactory.SingletonInstance.ClearPool(connection);
            }
        } 

        object ICloneable.Clone() { 
            SqlConnection clone = new SqlConnection(this); 
            Bid.Trace(" %d#, clone=%d#\n", ObjectID, clone.ObjectID);
            return clone; 
        }

        override public void Close() {
            IntPtr hscp; 
            Bid.ScopeEnter(out hscp, " %d#" , ObjectID);
            try { 
                SqlStatistics statistics = null; 

                SNIHandle bestEffortCleanupTarget = null; 
                RuntimeHelpers.PrepareConstrainedRegions();
                try {
#if DEBUG
                    TdsParser.ReliabilitySection tdsReliabilitySection = new TdsParser.ReliabilitySection(); 

                    RuntimeHelpers.PrepareConstrainedRegions(); 
                    try { 
                        tdsReliabilitySection.Start();
#else 
                    {
#endif //DEBUG
                        bestEffortCleanupTarget = SqlInternalConnection.GetBestEffortCleanupTarget(this);
                        statistics = SqlStatistics.StartTimer(Statistics); 

                        // The lock here is to protect against the command.cancel / connection.close race condition 
                        // The SqlInternalConnectionTds is set to OpenBusy during close, once this happens the cast below will fail and 
                        // the command will no longer be cancelable.  It might be desirable to be able to cancel the close opperation, but this is
                        // outside of the scope of Whidbey RTM.  See (SqlCommand::Cancel) for other lock. 
                        lock (InnerConnection) {
                            InnerConnection.CloseConnection(this, ConnectionFactory);
                        }
                        // does not require GC.KeepAlive(this) because of OnStateChange 

                        if (null != Statistics) { 
                            ADP.TimerCurrent(out _statistics._closeTimestamp); 
                        }
                    } 
 #if DEBUG
                    finally {
                        tdsReliabilitySection.Stop();
                    } 
#endif //DEBUG
                } 
                catch (System.OutOfMemoryException e) { 
                    Abort(e);
                    throw; 
                }
                catch (System.StackOverflowException e) {
                    Abort(e);
                    throw; 
                }
                catch (System.Threading.ThreadAbortException e) { 
                    Abort(e); 
                    SqlInternalConnection.BestEffortCleanup(bestEffortCleanupTarget);
                    throw; 
                }
                finally {
                    SqlStatistics.StopTimer(statistics);
                } 
            }
            finally { 
                SqlDebugContext  sdc = _sdc; 
                _sdc = null;
                Bid.ScopeLeave(ref hscp); 
                if (sdc != null) {
                   sdc.Dispose();
                }
            } 
        }
 
        new public SqlCommand CreateCommand() { 
            return new SqlCommand(null, this);
        } 

        private void DisposeMe(bool disposing) { // MDAC 65459
        }
 
        public void EnlistDistributedTransaction(System.EnterpriseServices.ITransaction transaction) {
            if (IsContextConnection) { 
                throw SQL.NotAvailableOnContextConnection(); 
            }
 
            EnlistDistributedTransactionHelper(transaction);
        }

        override public void Open() { 
            IntPtr hscp;
            Bid.ScopeEnter(out hscp, " %d#", ObjectID) ; 
            try { 
                if (StatisticsEnabled) {
                    if (null == _statistics) { 
                        _statistics = new SqlStatistics();
                    }
                    else {
                        _statistics.ContinueOnNewConnection(); 
                    }
                } 
 
                SNIHandle bestEffortCleanupTarget = null;
                SqlStatistics statistics = null; 
                RuntimeHelpers.PrepareConstrainedRegions();
                try {
#if DEBUG
                    TdsParser.ReliabilitySection tdsReliabilitySection = new TdsParser.ReliabilitySection(); 

                    RuntimeHelpers.PrepareConstrainedRegions(); 
                    try { 
                        tdsReliabilitySection.Start();
#else 
                    {
#endif //DEBUG
                        statistics = SqlStatistics.StartTimer(Statistics);
 
                        InnerConnection.OpenConnection(this, ConnectionFactory);
                        // does not require GC.KeepAlive(this) because of OnStateChange 
 
                        // GetBestEffortCleanup must happen AFTER OpenConnection to get the correct target.
                        bestEffortCleanupTarget = SqlInternalConnection.GetBestEffortCleanupTarget(this); 

                        SqlInternalConnectionSmi innerConnection = (InnerConnection as SqlInternalConnectionSmi);
                        if (null != innerConnection) {
                            innerConnection.AutomaticEnlistment(); 
                        }
                        else { 
                            Debug.Assert(Parser != null, "Where's the parser?"); 

                            if (StatisticsEnabled) { 
                                ADP.TimerCurrent(out _statistics._openTimestamp);
                                Parser.Statistics = _statistics;
                            }
                            else { 
                                Parser.Statistics = null;
                                _statistics = null; // in case of previous Open/Close/reset_CollectStats sequence 
                            } 
                            CompleteOpen();
                        } 
                    }
#if DEBUG
                    finally {
                        tdsReliabilitySection.Stop(); 
                    }
#endif //DEBUG 
                } 
                catch (System.OutOfMemoryException e) {
                    Abort(e); 
                    throw;
                }
                catch (System.StackOverflowException e) {
                    Abort(e); 
                    throw;
                } 
                catch (System.Threading.ThreadAbortException e) { 
                    Abort(e);
                    SqlInternalConnection.BestEffortCleanup(bestEffortCleanupTarget); 
                    throw;
                }
                finally {
                    SqlStatistics.StopTimer(statistics); 
                }
            } 
            finally { 
                Bid.ScopeLeave(ref hscp) ;
            } 
        }


        // 
        // INTERNAL PROPERTIES
        // 
 
        internal bool HasLocalTransaction {
            get { 
                return GetOpenConnection().HasLocalTransaction;
            }
        }
 
        internal bool HasLocalTransactionFromAPI {
            get { 
                return GetOpenConnection().HasLocalTransactionFromAPI; 
            }
        } 

        internal bool IsShiloh {
            get {
                return GetOpenConnection().IsShiloh; 
            }
        } 
 
        internal bool IsYukonOrNewer {
            get { 
                return GetOpenConnection().IsYukonOrNewer;
            }
        }
 
        internal bool IsKatmaiOrNewer {
            get { 
                return GetOpenConnection().IsKatmaiOrNewer; 
            }
        } 

        internal TdsParser Parser {
            get {
                SqlInternalConnectionTds tdsConnection = (GetOpenConnection() as SqlInternalConnectionTds); 
                if (null == tdsConnection) {
                    throw SQL.NotAvailableOnContextConnection(); 
                } 
                return tdsConnection.Parser;
            } 
        }

        internal bool Asynchronous {
            get { 
                SqlConnectionString constr = (SqlConnectionString)ConnectionOptions;
                return ((null != constr) ? constr.Asynchronous : SqlConnectionString.DEFAULT.Asynchronous); 
            } 
        }
 
        //
        // INTERNAL METHODS
        //
 
        internal void AddPreparedCommand(SqlCommand cmd) {
            GetOpenConnection().AddPreparedCommand(cmd); 
        } 

        internal void ValidateConnectionForExecute(string method, SqlCommand command) { 
            SqlInternalConnection innerConnection = GetOpenConnection(method);
            innerConnection.ValidateConnectionForExecute(command);
        }
 
        // Surround name in brackets and then escape any end bracket to protect against SQL Injection.
        // NOTE: if the user escapes it themselves it will not work, but this was the case in V1 as well 
        // as native OleDb and Odbc. 
        static internal string FixupDatabaseTransactionName(string name) {
            if (!ADP.IsEmpty(name)) { 
                return SqlServerEscapeHelper.EscapeIdentifier(name);
            }
            else {
                return name; 
            }
        } 
 
        internal void OnError(SqlException exception, bool breakConnection) {
            Debug.Assert(exception != null && exception.Errors.Count != 0, "SqlConnection: OnError called with null or empty exception!"); 

            // Bug fix - MDAC 49022 - connection open after failure...  Problem was parser was passing
            // Open as a state - because the parser's connection to the netlib was open.  We would
            // then set the connection state to the parser's state - which is not correct.  The only 
            // time the connection state should change to what is passed in to this function is if
            // the parser is broken, then we should be closed.  Changed to passing in 
            // TdsParserState, not ConnectionState. 
            // fixed by [....]
 
            if (breakConnection && (ConnectionState.Open == State)) {
                Bid.Trace(" %d#, Connection broken.\n", ObjectID) ;
                this.Close();
            } 

            if (exception.Class >= TdsEnums.MIN_ERROR_CLASS) { 
                // It is an error, and should be thrown.  Class of TdsEnums.MIN_ERROR_CLASS or above is an error, 
                // below TdsEnums.MIN_ERROR_CLASS denotes an info message.
                throw exception; 
            }
            else {
                // If it is a class < TdsEnums.MIN_ERROR_CLASS, it is a warning collection - so pass to handler
                this.OnInfoMessage(new SqlInfoMessageEventArgs(exception)); 
            }
        } 
 
        internal void RemovePreparedCommand(SqlCommand cmd) {
            GetOpenConnection().RemovePreparedCommand(cmd); 
        }

        //
        // PRIVATE METHODS 
        //
 
        // SxS: using Debugger.IsAttached 
        //
        [ResourceExposure(ResourceScope.None)] 
        [ResourceConsumption(ResourceScope.Process, ResourceScope.Process)]
        private void CompleteOpen() {
            Debug.Assert(ConnectionState.Open == State, "CompleteOpen not open");
            // be sure to mark as open so SqlDebugCheck can issue Query 

            // check to see if we need to hook up sql-debugging if a debugger is attached 
            // We only need this check for Shiloh and earlier servers. 
            if (!GetOpenConnection().IsYukonOrNewer &&
                    System.Diagnostics.Debugger.IsAttached) { 
                bool debugCheck = false;
                try {
                    new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Demand(); // MDAC 66682, 69017
                    debugCheck = true; 
                }
                catch (SecurityException e) { 
                    ADP.TraceExceptionWithoutRethrow(e); 
                }
 
                if (debugCheck) {
                    // if we don't have Unmanaged code permission, don't check for debugging
                    // but let the connection be opened while under the debugger
                    CheckSQLDebugOnConnect(); 
                }
            } 
        } 

        internal SqlInternalConnection GetOpenConnection() { 
            SqlInternalConnection innerConnection = (InnerConnection as SqlInternalConnection);
            if (null == innerConnection) {
                throw ADP.ClosedConnectionError();
            } 
            return innerConnection;
        } 
 
        internal SqlInternalConnection GetOpenConnection(string method) {
            DbConnectionInternal innerConnection = InnerConnection; 
            SqlInternalConnection innerSqlConnection = (innerConnection as SqlInternalConnection);
            if (null == innerSqlConnection) {
                throw ADP.OpenConnectionRequired(method, innerConnection.State);
            } 
            return innerSqlConnection;
        } 
 
        internal SqlInternalConnectionTds GetOpenTdsConnection() {
            SqlInternalConnectionTds innerConnection = (InnerConnection as SqlInternalConnectionTds); 
            if (null == innerConnection) {
                throw ADP.ClosedConnectionError();
            }
            return innerConnection; 
        }
 
        internal SqlInternalConnectionTds GetOpenTdsConnection(string method) { 
            SqlInternalConnectionTds innerConnection = (InnerConnection as SqlInternalConnectionTds);
            if (null == innerConnection) { 
                throw ADP.OpenConnectionRequired(method, innerConnection.State);
            }
            return innerConnection;
        } 

        internal void OnInfoMessage(SqlInfoMessageEventArgs imevent) { 
            if (Bid.TraceOn) { 
                Debug.Assert(null != imevent, "null SqlInfoMessageEventArgs");
                Bid.Trace(" %d#, Message='%ls'\n", ObjectID, ((null != imevent) ? imevent.Message : "")); 
            }
            SqlInfoMessageEventHandler handler = (SqlInfoMessageEventHandler)Events[EventInfoMessage];
            if (null != handler) {
                try { 
                    handler(this, imevent);
                } 
                catch (Exception e) { // MDAC 53175 
                    if (!ADP.IsCatchableOrSecurityExceptionType(e)) {
                        throw; 
                    }

                    ADP.TraceExceptionWithoutRethrow(e);
                } 
            }
        } 
 
        //
        // SQL DEBUGGING SUPPORT 
        //

        // this only happens once per connection
        // SxS: using named file mapping APIs 
        //
        [ResourceExposure(ResourceScope.None)] 
        [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] 
        private void CheckSQLDebugOnConnect() {
            IntPtr hFileMap; 
            uint pid = (uint)SafeNativeMethods.GetCurrentProcessId();

            string mapFileName;
 
            // If Win2k or later, prepend "Global\\" to enable this to work through TerminalServices.
            if (ADP.IsPlatformNT5) { 
                mapFileName = "Global\\" + TdsEnums.SDCI_MAPFILENAME; 
            }
            else { 
                mapFileName = TdsEnums.SDCI_MAPFILENAME;
            }

            mapFileName = mapFileName + pid.ToString(CultureInfo.InvariantCulture); 

            hFileMap = NativeMethods.OpenFileMappingA(0x4/*FILE_MAP_READ*/, false, mapFileName); 
 
            if (ADP.PtrZero != hFileMap) {
                IntPtr pMemMap = NativeMethods.MapViewOfFile(hFileMap, 0x4/*FILE_MAP_READ*/, 0, 0, IntPtr.Zero); 
                if (ADP.PtrZero != pMemMap) {
                    SqlDebugContext sdc = new SqlDebugContext();
                    sdc.hMemMap = hFileMap;
                    sdc.pMemMap = pMemMap; 
                    sdc.pid = pid;
 
                    // optimization: if we only have to refresh memory-mapped data at connection open time 
                    // optimization: then call here instead of in CheckSQLDebug() which gets called
                    // optimization: at command execution time 
                    // RefreshMemoryMappedData(sdc);

                    // delaying setting out global state until after we issue this first SQLDebug command so that
                    // we don't reentrantly call into CheckSQLDebug 
                    CheckSQLDebug(sdc);
                    // now set our global state 
                    _sdc = sdc; 
                }
            } 
        }

        // This overload is called by the Command object when executing stored procedures.  Note that
        // if SQLDebug has never been called, it is a noop. 
        internal void CheckSQLDebug() {
            if (null != _sdc) 
                CheckSQLDebug(_sdc); 
        }
 
        // SxS: using GetCurrentThreadId
        [ResourceExposure(ResourceScope.None)]
        [ResourceConsumption(ResourceScope.Process, ResourceScope.Process)]
        [SecurityPermissionAttribute(SecurityAction.Demand, Flags = SecurityPermissionFlag.UnmanagedCode)] // MDAC 66682, 69017 
        private void CheckSQLDebug(SqlDebugContext sdc) {
            // check to see if debugging has been activated 
            Debug.Assert(null != sdc, "SQL Debug: invalid null debugging context!"); 

#pragma warning disable 618 
            uint tid = (uint)AppDomain.GetCurrentThreadId();    // Sql Debugging doesn't need fiber support;
#pragma warning restore 618
            RefreshMemoryMappedData(sdc);
 
            //
 
 

            // If we get here, the debugger must be hooked up. 
            if (!sdc.active) {
                if (sdc.fOption/*TdsEnums.SQLDEBUG_ON*/) {
                    // turn on
                    sdc.active = true; 
                    sdc.tid = tid;
                    try { 
                        IssueSQLDebug(TdsEnums.SQLDEBUG_ON, sdc.machineName, sdc.pid, sdc.dbgpid, sdc.sdiDllName, sdc.data); 
                        sdc.tid = 0; // reset so that the first successful time through, we notify the server of the context switch
                    } 
                    catch {
                        sdc.active = false;
                        throw;
                    } 
                }
            } 
 
            // be sure to pick up thread context switch, especially the first time through
            if (sdc.active) { 
                if (!sdc.fOption/*TdsEnums.SQLDEBUG_OFF*/) {
                    // turn off and free the memory
                    sdc.Dispose();
                    // okay if we throw out here, no state to clean up 
                    IssueSQLDebug(TdsEnums.SQLDEBUG_OFF, null, 0, 0, null, null);
                } 
                else { 
                    // notify server of context change
                    if (sdc.tid != tid) { 
                        sdc.tid = tid;
                        try {
                            IssueSQLDebug(TdsEnums.SQLDEBUG_CONTEXT, null, sdc.pid, sdc.tid, null, null);
                        } 
                        catch {
                            sdc.tid = 0; 
                            throw; 
                        }
                    } 
                }
            }
        }
 
        private void IssueSQLDebug(uint option, string machineName, uint pid, uint id, string sdiDllName, byte[] data) {
 
            if (GetOpenConnection().IsYukonOrNewer) { 
                //
                return; 
            }

            //
 
            SqlCommand c = new SqlCommand(TdsEnums.SP_SDIDEBUG, this);
            c.CommandType = CommandType.StoredProcedure; 
 
            // context param
            SqlParameter p = new SqlParameter(null, SqlDbType.VarChar, TdsEnums.SQLDEBUG_MODE_NAMES[option].Length); 
            p.Value = TdsEnums.SQLDEBUG_MODE_NAMES[option];
            c.Parameters.Add(p);

            if (option == TdsEnums.SQLDEBUG_ON) { 
                // debug dll name
                p = new SqlParameter(null, SqlDbType.VarChar, sdiDllName.Length); 
                p.Value = sdiDllName; 
                c.Parameters.Add(p);
                // debug machine name 
                p = new SqlParameter(null, SqlDbType.VarChar, machineName.Length);
                p.Value = machineName;
                c.Parameters.Add(p);
            } 

            if (option != TdsEnums.SQLDEBUG_OFF) { 
                // client pid 
                p = new SqlParameter(null, SqlDbType.Int);
                p.Value = pid; 
                c.Parameters.Add(p);
                // dbgpid or tid
                p = new SqlParameter(null, SqlDbType.Int);
                p.Value = id; 
                c.Parameters.Add(p);
            } 
 
            if (option == TdsEnums.SQLDEBUG_ON) {
                // debug data 
                p = new SqlParameter(null, SqlDbType.VarBinary, (null != data) ? data.Length : 0);
                p.Value = data;
                c.Parameters.Add(p);
            } 

            c.ExecuteNonQuery(); 
        } 

        public static void ChangePassword(string connectionString, string newPassword) { 
            IntPtr hscp;
            Bid.ScopeEnter(out hscp, "") ;
            try {
                if (ADP.IsEmpty(connectionString)) { 
                    throw SQL.ChangePasswordArgumentMissing("connectionString");
                } 
                if (ADP.IsEmpty(newPassword)) { 
                    throw SQL.ChangePasswordArgumentMissing("newPassword");
                } 
                if (TdsEnums.MAXLEN_NEWPASSWORD < newPassword.Length) {
                    throw ADP.InvalidArgumentLength("newPassword", TdsEnums.MAXLEN_NEWPASSWORD);
                }
 
                SqlConnectionString connectionOptions = SqlConnectionFactory.FindSqlConnectionOptions(connectionString);
                if (connectionOptions.IntegratedSecurity) { 
                    throw SQL.ChangePasswordConflictsWithSSPI(); 
                }
                if (! ADP.IsEmpty(connectionOptions.AttachDBFilename)) { 
                    throw SQL.ChangePasswordUseOfUnallowedKey(SqlConnectionString.KEY.AttachDBFilename);
                }
                if (connectionOptions.ContextConnection) {
                    throw SQL.ChangePasswordUseOfUnallowedKey(SqlConnectionString.KEY.Context_Connection); 
                }
 
                System.Security.PermissionSet permissionSet = connectionOptions.CreatePermissionSet(); 
                permissionSet.Demand();
 
                // note: This is the only case where we directly construt the internal connection, passing in the new password.
                // Normally we would simply create a regular connectoin and open it but there is no other way to pass the
                // new password down to the constructor. Also it would have an unwanted impact on the connection pool
                // 
                using (SqlInternalConnectionTds con = new SqlInternalConnectionTds(null, connectionOptions, null, newPassword, (SqlConnection)null, false)) {
                    if (!con.IsYukonOrNewer) { 
                        throw SQL.ChangePasswordRequiresYukon(); 
                    }
                } 
                SqlConnectionFactory.SingletonInstance.ClearPool(connectionString);
            }
            finally {
                Bid.ScopeLeave(ref hscp) ; 
            }
        } 
 
        // updates our context with any changes made to the memory-mapped data by an external process
        static private void RefreshMemoryMappedData(SqlDebugContext sdc) { 
            Debug.Assert(ADP.PtrZero != sdc.pMemMap, "SQL Debug: invalid null value for pMemMap!");
            // copy memory mapped file contents into managed types
            MEMMAP memMap = (MEMMAP)Marshal.PtrToStructure(sdc.pMemMap, typeof(MEMMAP));
            sdc.dbgpid = memMap.dbgpid; 
            sdc.fOption = (memMap.fOption == 1) ? true : false;
            // xlate ansi byte[] -> managed strings 
            Encoding cp = System.Text.Encoding.GetEncoding(TdsEnums.DEFAULT_ENGLISH_CODE_PAGE_VALUE); 
            sdc.machineName = cp.GetString(memMap.rgbMachineName, 0, memMap.rgbMachineName.Length);
            sdc.sdiDllName = cp.GetString(memMap.rgbDllName, 0, memMap.rgbDllName.Length); 
            // just get data reference
            sdc.data = memMap.rgbData;
        }
 
        public void ResetStatistics() {
            if (IsContextConnection) { 
                throw SQL.NotAvailableOnContextConnection(); 
            }
 
            if (null != Statistics) {
                Statistics.Reset();
                if (ConnectionState.Open == State) {
                    // update timestamp; 
                    ADP.TimerCurrent(out _statistics._openTimestamp);
                } 
            } 
        }
 
        public IDictionary RetrieveStatistics() {
            if (IsContextConnection) {
                throw SQL.NotAvailableOnContextConnection();
            } 

            if (null != Statistics) { 
                UpdateStatistics(); 
                return Statistics.GetHashtable();
            } 
            else {
                return new SqlStatistics().GetHashtable();
            }
        } 

        private void UpdateStatistics() { 
            if (ConnectionState.Open == State) { 
                // update timestamp
                ADP.TimerCurrent(out _statistics._closeTimestamp); 
            }
            // delegate the rest of the work to the SqlStatistics class
            Statistics.UpdateStatistics();
        } 

        // 
        // UDT SUPPORT 
        //
 
        //
        internal static void CheckGetExtendedUDTInfo(SqlMetaDataPriv metaData, bool fThrow) {
            if (metaData.udtType == null) { // If null, we have not obtained extended info.
                Debug.Assert(!ADP.IsEmpty(metaData.udtAssemblyQualifiedName), "Unexpected state on GetUDTInfo"); 
                // 2nd argument determines whether exception from Assembly.Load is thrown.
    			metaData.udtType = Type.GetType(metaData.udtAssemblyQualifiedName, fThrow); 
                if (fThrow && metaData.udtType == null) { 
                    //
                    throw SQL.UDTUnexpectedResult(metaData.udtAssemblyQualifiedName); 
                }
            }
        }
 
        internal object GetUdtValue(object value, SqlMetaDataPriv metaData, bool returnDBNull) {
            if (returnDBNull && ADP.IsNull(value)) { 
                return DBNull.Value; 
            }
 
            object o = null;

            // Since the serializer doesn't handle nulls...
            if (ADP.IsNull(value)) { 
                Type t = metaData.udtType;
                Debug.Assert(t != null, "Unexpected null of udtType on GetUdtValue!"); 
                o = t.InvokeMember("Null", BindingFlags.Public | BindingFlags.GetProperty | BindingFlags.Static, null, null, new Object[]{}, CultureInfo.InvariantCulture); 
                Debug.Assert(o != null);
                return o; 
            }
            else {

                MemoryStream stm = new MemoryStream((byte[]) value); 

                o = SerializationHelperSql9.Deserialize(stm, metaData.udtType); 
 
                Debug.Assert(o != null, "object could NOT be created");
                return o; 
            }
        }

        internal byte[] GetBytes(object o) { 
            Microsoft.SqlServer.Server.Format format  = Microsoft.SqlServer.Server.Format.Native;
            int    maxSize = 0; 
            return GetBytes(o, out format, out maxSize); 
        }
 
        internal byte[] GetBytes(object o, out Microsoft.SqlServer.Server.Format format, out int maxSize) {
            SqlUdtInfo attr = AssemblyCache.GetInfoFromType(o.GetType());
            maxSize = attr.MaxByteSize;
            format  = attr.SerializationFormat; 

            if (maxSize < -1 || maxSize >= UInt16.MaxValue) { // Do we need this?  Is this the right place? 
                throw new InvalidOperationException(o.GetType() + ": invalid Size"); 
            }
 
            byte[] retval;

            using (MemoryStream stm = new MemoryStream(maxSize < 0 ? 0 : maxSize)) {
                SerializationHelperSql9.Serialize(stm, o); 
                retval = stm.ToArray();
            } 
            return retval; 
        }
    } // SqlConnection 

    //

 

 
 
    [
    ComVisible(true), 
    ClassInterface(ClassInterfaceType.None),
    Guid("afef65ad-4577-447a-a148-83acadd3d4b9"),
    ]
    [System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.LinkDemand, Name = "FullTrust")] 
    public sealed class SQLDebugging: ISQLDebug {
 
        // Security stuff 
        const int STANDARD_RIGHTS_REQUIRED = (0x000F0000);
        const int DELETE = (0x00010000); 
        const int READ_CONTROL = (0x00020000);
        const int WRITE_DAC = (0x00040000);
        const int WRITE_OWNER = (0x00080000);
        const int SYNCHRONIZE = (0x00100000); 
        const int FILE_ALL_ACCESS = (STANDARD_RIGHTS_REQUIRED | SYNCHRONIZE | 0x000001FF);
        const uint GENERIC_READ = (0x80000000); 
        const uint GENERIC_WRITE = (0x40000000); 
        const uint GENERIC_EXECUTE = (0x20000000);
        const uint GENERIC_ALL = (0x10000000); 

        const int SECURITY_DESCRIPTOR_REVISION = (1);
        const int ACL_REVISION = (2);
 
        const int SECURITY_AUTHENTICATED_USER_RID = (0x0000000B);
        const int SECURITY_LOCAL_SYSTEM_RID = (0x00000012); 
        const int SECURITY_BUILTIN_DOMAIN_RID = (0x00000020); 
        const int SECURITY_WORLD_RID = (0x00000000);
        const byte SECURITY_NT_AUTHORITY = 5; 
        const int DOMAIN_GROUP_RID_ADMINS = (0x00000200);
        const int DOMAIN_ALIAS_RID_ADMINS = (0x00000220);

        const int sizeofSECURITY_ATTRIBUTES = 12; // sizeof(SECURITY_ATTRIBUTES); 
        const int sizeofSECURITY_DESCRIPTOR = 20; // sizeof(SECURITY_DESCRIPTOR);
        const int sizeofACCESS_ALLOWED_ACE = 12; // sizeof(ACCESS_ALLOWED_ACE); 
        const int sizeofACCESS_DENIED_ACE = 12; // sizeof(ACCESS_DENIED_ACE); 
        const int sizeofSID_IDENTIFIER_AUTHORITY = 6; // sizeof(SID_IDENTIFIER_AUTHORITY)
        const int sizeofACL = 8; // sizeof(ACL); 

        private IntPtr CreateSD(ref IntPtr pDacl) {
            IntPtr pSecurityDescriptor = IntPtr.Zero;
            IntPtr pUserSid = IntPtr.Zero; 
            IntPtr pAdminSid = IntPtr.Zero;
            IntPtr pNtAuthority = IntPtr.Zero; 
            int cbAcl = 0; 
            bool status = false;
 
            pNtAuthority = Marshal.AllocHGlobal(sizeofSID_IDENTIFIER_AUTHORITY);
            if (pNtAuthority == IntPtr.Zero)
                goto cleanup;
            Marshal.WriteInt32(pNtAuthority, 0, 0); 
            Marshal.WriteByte(pNtAuthority, 4, 0);
            Marshal.WriteByte(pNtAuthority, 5, SECURITY_NT_AUTHORITY); 
 
            status =
            NativeMethods.AllocateAndInitializeSid( 
            pNtAuthority,
            (byte)1,
            SECURITY_AUTHENTICATED_USER_RID,
            0, 
            0,
            0, 
            0, 
            0,
            0, 
            0,
            ref pUserSid);

            if (!status || pUserSid == IntPtr.Zero) { 
                goto cleanup;
            } 
            status = 
            NativeMethods.AllocateAndInitializeSid(
            pNtAuthority, 
            (byte)2,
            SECURITY_BUILTIN_DOMAIN_RID,
            DOMAIN_ALIAS_RID_ADMINS,
            0, 
            0,
            0, 
            0, 
            0,
            0, 
            ref pAdminSid);

            if (!status || pAdminSid == IntPtr.Zero) {
                goto cleanup; 
            }
            status = false; 
            pSecurityDescriptor = Marshal.AllocHGlobal(sizeofSECURITY_DESCRIPTOR); 
            if (pSecurityDescriptor == IntPtr.Zero) {
                goto cleanup; 
            }
            for (int i = 0; i < sizeofSECURITY_DESCRIPTOR; i++)
                Marshal.WriteByte(pSecurityDescriptor, i, (byte)0);
            cbAcl = sizeofACL 
            + (2 * (sizeofACCESS_ALLOWED_ACE))
            + sizeofACCESS_DENIED_ACE 
            + NativeMethods.GetLengthSid(pUserSid) 
            + NativeMethods.GetLengthSid(pAdminSid);
 
            pDacl = Marshal.AllocHGlobal(cbAcl);
            if (pDacl == IntPtr.Zero) {
                goto cleanup;
            } 
            // rights must be added in a certain order.  Namely, deny access first, then add access
            if (NativeMethods.InitializeAcl(pDacl, cbAcl, ACL_REVISION)) 
                if (NativeMethods.AddAccessDeniedAce(pDacl, ACL_REVISION, WRITE_DAC, pUserSid)) 
                    if (NativeMethods.AddAccessAllowedAce(pDacl, ACL_REVISION, GENERIC_READ, pUserSid))
                        if (NativeMethods.AddAccessAllowedAce(pDacl, ACL_REVISION, GENERIC_ALL, pAdminSid)) 
                            if (NativeMethods.InitializeSecurityDescriptor(pSecurityDescriptor, SECURITY_DESCRIPTOR_REVISION))
                                if (NativeMethods.SetSecurityDescriptorDacl(pSecurityDescriptor, true, pDacl, false)) {
                                    status = true;
                                } 

            cleanup : 
            if (pNtAuthority != IntPtr.Zero) { 
                Marshal.FreeHGlobal(pNtAuthority);
            } 
            if (pAdminSid != IntPtr.Zero)
                NativeMethods.FreeSid(pAdminSid);
            if (pUserSid != IntPtr.Zero)
                NativeMethods.FreeSid(pUserSid); 
            if (status)
                return pSecurityDescriptor; 
            else { 
                if (pSecurityDescriptor != IntPtr.Zero) {
                    Marshal.FreeHGlobal(pSecurityDescriptor); 
                }
            }
            return IntPtr.Zero;
        } 

        // SxS: using file mapping API (CreateFileMapping) 
        // 
        [ResourceExposure(ResourceScope.None)]
        [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] 
        bool ISQLDebug.SQLDebug(int dwpidDebugger, int dwpidDebuggee, [MarshalAs(UnmanagedType.LPStr)] string pszMachineName,
        [MarshalAs(UnmanagedType.LPStr)] string pszSDIDLLName, int dwOption, int cbData, byte[] rgbData) {
            bool result = false;
            IntPtr hFileMap = IntPtr.Zero; 
            IntPtr pMemMap = IntPtr.Zero;
            IntPtr pSecurityDescriptor = IntPtr.Zero; 
            IntPtr pSecurityAttributes = IntPtr.Zero; 
            IntPtr pDacl = IntPtr.Zero;
 
            // validate the structure
            if (null == pszMachineName || null == pszSDIDLLName)
                return false;
 
            if (pszMachineName.Length > TdsEnums.SDCI_MAX_MACHINENAME ||
            pszSDIDLLName.Length > TdsEnums.SDCI_MAX_DLLNAME) 
                return false; 

            // note that these are ansi strings 
            Encoding cp = System.Text.Encoding.GetEncoding(TdsEnums.DEFAULT_ENGLISH_CODE_PAGE_VALUE);
            byte[] rgbMachineName = cp.GetBytes(pszMachineName);
            byte[] rgbSDIDLLName = cp.GetBytes(pszSDIDLLName);
 
            if (null != rgbData && cbData > TdsEnums.SDCI_MAX_DATA)
                return false; 
 
            string mapFileName;
 
            // If Win2k or later, prepend "Global\\" to enable this to work through TerminalServices.
            if (ADP.IsPlatformNT5) {
                mapFileName = "Global\\" + TdsEnums.SDCI_MAPFILENAME;
            } 
            else {
                mapFileName = TdsEnums.SDCI_MAPFILENAME; 
            } 

            mapFileName = mapFileName + dwpidDebuggee.ToString(CultureInfo.InvariantCulture); 

            // Create Security Descriptor
            pSecurityDescriptor = CreateSD(ref pDacl);
            pSecurityAttributes = Marshal.AllocHGlobal(sizeofSECURITY_ATTRIBUTES); 
            if ((pSecurityDescriptor == IntPtr.Zero) || (pSecurityAttributes == IntPtr.Zero))
                return false; 
 
            Marshal.WriteInt32(pSecurityAttributes, 0, sizeofSECURITY_ATTRIBUTES); // nLength = sizeof(SECURITY_ATTRIBUTES)
            Marshal.WriteIntPtr(pSecurityAttributes, 4, pSecurityDescriptor); // lpSecurityDescriptor = pSecurityDescriptor 
            Marshal.WriteInt32(pSecurityAttributes, 8, 0); // bInheritHandle = FALSE
            hFileMap = NativeMethods.CreateFileMappingA(
            ADP.InvalidPtr/*INVALID_HANDLE_VALUE*/,
            pSecurityAttributes, 
            0x4/*PAGE_READWRITE*/,
            0, 
            Marshal.SizeOf(typeof(MEMMAP)), 
            mapFileName);
 
            if (IntPtr.Zero == hFileMap) {
                goto cleanup;
            }
 

            pMemMap = NativeMethods.MapViewOfFile(hFileMap, 0x6/*FILE_MAP_READ|FILE_MAP_WRITE*/, 0, 0, IntPtr.Zero); 
 
            if (IntPtr.Zero == pMemMap) {
                goto cleanup; 
            }

            // copy data to memory-mapped file
            // layout of MEMMAP structure is: 
            // uint dbgpid
            // uint fOption 
            // byte[32] machineName 
            // byte[16] sdiDllName
            // uint dbData 
            // byte[255] vData
            int offset = 0;
            Marshal.WriteInt32(pMemMap, offset, (int)dwpidDebugger);
            offset += 4; 
            Marshal.WriteInt32(pMemMap, offset, (int)dwOption);
            offset += 4; 
            Marshal.Copy(rgbMachineName, 0, ADP.IntPtrOffset(pMemMap, offset), rgbMachineName.Length); 
            offset += TdsEnums.SDCI_MAX_MACHINENAME;
            Marshal.Copy(rgbSDIDLLName, 0, ADP.IntPtrOffset(pMemMap, offset), rgbSDIDLLName.Length); 
            offset += TdsEnums.SDCI_MAX_DLLNAME;
            Marshal.WriteInt32(pMemMap, offset, (int)cbData);
            offset += 4;
            if (null != rgbData) { 
                Marshal.Copy(rgbData, 0, ADP.IntPtrOffset(pMemMap, offset), (int)cbData);
            } 
            NativeMethods.UnmapViewOfFile(pMemMap); 
            result = true;
        cleanup : 
            if (result == false) {
                if (hFileMap != IntPtr.Zero)
                    NativeMethods.CloseHandle(hFileMap);
            } 
            if (pSecurityAttributes != IntPtr.Zero)
                Marshal.FreeHGlobal(pSecurityAttributes); 
            if (pSecurityDescriptor != IntPtr.Zero) 
                Marshal.FreeHGlobal(pSecurityDescriptor);
            if (pDacl != IntPtr.Zero) 
                Marshal.FreeHGlobal(pDacl);
            return result;
        }
    } 

    // this is a private interface to com+ users 
    // do not change this guid 
    [
    ComImport, 
    ComVisible(true),
    Guid("6cb925bf-c3c0-45b3-9f44-5dd67c7b7fe8"),
    InterfaceType(ComInterfaceType.InterfaceIsIUnknown),
    BestFitMapping(false, ThrowOnUnmappableChar = true), 
    ]
    interface ISQLDebug { 
 
        [System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.LinkDemand, Name = "FullTrust")]
        bool SQLDebug( 
        int dwpidDebugger,
        int dwpidDebuggee,
        [MarshalAs(UnmanagedType.LPStr)] string pszMachineName,
        [MarshalAs(UnmanagedType.LPStr)] string pszSDIDLLName, 
        int dwOption,
        int cbData, 
        byte[] rgbData); 
    }
 
    sealed class SqlDebugContext: IDisposable {
        // context data
        internal uint pid = 0;
        internal uint tid = 0; 
        internal bool active = false;
        // memory-mapped data 
        internal IntPtr pMemMap = ADP.PtrZero; 
        internal IntPtr hMemMap = ADP.PtrZero;
        internal uint dbgpid = 0; 
        internal bool fOption = false;
        internal string machineName = null;
        internal string sdiDllName = null;
        internal byte[] data = null; 

        public void Dispose() { 
            Dispose(true); 
            GC.SuppressFinalize(this);
        } 

        // using CloseHandle and UnmapViewOfFile - no exposure
        [ResourceExposure(ResourceScope.None)]
        [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] 
        private void Dispose(bool disposing) {
            if (disposing) { 
                // Nothing to do here 
                ;
            } 
            if (pMemMap != IntPtr.Zero) {
                NativeMethods.UnmapViewOfFile(pMemMap);
                pMemMap = IntPtr.Zero;
            } 
            if (hMemMap != IntPtr.Zero) {
                NativeMethods.CloseHandle(hMemMap); 
                hMemMap = IntPtr.Zero; 
            }
            active = false; 
        }

        ~SqlDebugContext() {
                Dispose(false); 
        }
 
    } 

    // native interop memory mapped structure for sdi debugging 
    [StructLayoutAttribute(LayoutKind.Sequential, Pack = 1)]
    internal struct MEMMAP {
        [MarshalAs(UnmanagedType.U4)]
        internal uint dbgpid; // id of debugger 
        [MarshalAs(UnmanagedType.U4)]
        internal uint fOption; // 1 - start debugging, 0 - stop debugging 
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)] 
        internal byte[] rgbMachineName;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)] 
        internal byte[] rgbDllName;
        [MarshalAs(UnmanagedType.U4)]
        internal uint cbData;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 255)] 
        internal byte[] rgbData;
    } 
} // System.Data.SqlClient namespace 

 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

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