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SqlTransaction Class

Represents a Transact-SQL transaction to be made in a SQL Server database. This class cannot be inherited.

Namespace:  System.Data.SqlClient
Assembly:  System.Data (in System.Data.dll)

'Declaration
Public NotInheritable Class SqlTransaction _
	Inherits DbTransaction

The SqlTransaction type exposes the following members.

  NameDescription
Public propertyConnectionGets the SqlConnection object associated with the transaction, or Nothing if the transaction is no longer valid.
Public propertyIsolationLevelSpecifies the IsolationLevel for this transaction. (Overrides DbTransaction.IsolationLevel.)
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  NameDescription
Public methodCommitCommits the database transaction. (Overrides DbTransaction.Commit.)
Public methodCreateObjRefCreates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object. (Inherited from MarshalByRefObject.)
Public methodDisposeReleases the unmanaged resources used by the DbTransaction. (Inherited from DbTransaction.)
Public methodEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Public methodGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodGetLifetimeServiceRetrieves the current lifetime service object that controls the lifetime policy for this instance. (Inherited from MarshalByRefObject.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodInitializeLifetimeServiceObtains a lifetime service object to control the lifetime policy for this instance. (Inherited from MarshalByRefObject.)
Public methodRollbackRolls back a transaction from a pending state. (Overrides DbTransaction.Rollback.)
Public methodRollback(String)Rolls back a transaction from a pending state, and specifies the transaction or savepoint name.
Public methodSaveCreates a savepoint in the transaction that can be used to roll back a part of the transaction, and specifies the savepoint name.
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
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  NameDescription
Explicit interface implemetationPrivate propertyIDbTransaction.ConnectionGets the DbConnection object associated with the transaction, or a null reference if the transaction is no longer valid. (Inherited from DbTransaction.)
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The application creates a SqlTransaction object by calling BeginTransaction on the SqlConnection object. All subsequent operations associated with the transaction (for example, committing or aborting the transaction), are performed on the SqlTransaction object.

NoteNote

Try/Catch exception handling should always be used when committing or rolling back a SqlTransaction. Both Commit and Rollback generate an InvalidOperationException if the connection is terminated or if the transaction has already been rolled back on the server.

For more information on SQL Server transactions, see Explicit Transactions and Coding Efficient Transactions.

The following example creates a SqlConnection and a SqlTransaction. It also demonstrates how to use the BeginTransaction, Commit, and Rollback methods. The transaction is rolled back on any error, or if it is disposed without first being committed. Try/Catch error handling is used to handle any errors when attempting to commit or roll back the transaction.

Private Sub ExecuteSqlTransaction(ByVal connectionString As String)
    Using connection As New SqlConnection(connectionString)
        connection.Open()

        Dim command As SqlCommand = connection.CreateCommand()
        Dim transaction As SqlTransaction

        ' Start a local transaction
        transaction = connection.BeginTransaction("SampleTransaction")

        ' Must assign both transaction object and connection 
        ' to Command object for a pending local transaction.
        command.Connection = connection
        command.Transaction = transaction

        Try
            command.CommandText = _
              "Insert into Region (RegionID, RegionDescription) VALUES (100, 'Description')"
            command.ExecuteNonQuery()
            command.CommandText = _
              "Insert into Region (RegionID, RegionDescription) VALUES (101, 'Description')"

            command.ExecuteNonQuery()

            ' Attempt to commit the transaction.
            transaction.Commit()
            Console.WriteLine("Both records are written to database.")

        Catch ex As Exception
            Console.WriteLine("Commit Exception Type: {0}", ex.GetType())
            Console.WriteLine("  Message: {0}", ex.Message)

            ' Attempt to roll back the transaction. 
            Try
                transaction.Rollback()

            Catch ex2 As Exception
                ' This catch block will handle any errors that may have occurred 
                ' on the server that would cause the rollback to fail, such as 
                ' a closed connection.
                Console.WriteLine("Rollback Exception Type: {0}", ex2.GetType())
                Console.WriteLine("  Message: {0}", ex2.Message)
            End Try 
        End Try 
    End Using 
End Sub

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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