EndExecuteNonQuery method

Public Function EndExecuteNonQuery(
    ByVal asyncResult As IAsyncResult
) As Integer

public int EndExecuteNonQuery(IAsyncResult asyncResult)

asyncResult The System.IAsyncResult returned by the call to BeginExecuteNonQuery.

The number of rows affected (the same behavior as ExecuteNonQuery).

ArgumentException The asyncResult parameter is null (Nothing in Microsoft Visual Basic).
InvalidOperationException The EndExecuteNonQuery(IAsyncResult) was called more than once for a single command execution, or the method was mismatched against its execution method.

You must call EndExecuteNonQuery once for every call to BeginExecuteNonQuery. The call must be after BeginExecuteNonQuery has returned. ADO.NET is not thread safe; it is your responsibility to ensure that BeginExecuteNonQuery has returned. The System.IAsyncResult passed to EndExecuteNonQuery must be the same as the one returned from the BeginExecuteNonQuery call that is being completed. It is an error to call EndExecuteNonQuery to end a call to BeginExecuteReader, and vice versa.

If an error occurs while executing the command, the exception is thrown when EndExecuteNonQuery is called.

There are four ways to wait for execution to complete:

Call EndExecuteNonQuery Calling EndExecuteNonQuery blocks until the command completes. For example:

' Visual Basic
Dim cmd As ULCommand = new ULCommand( _
    "UPDATE Departments" _
    + " SET DepartmentName = 'Engineering'" _
    + " WHERE DepartmentID=100", _
    conn _
)

Dim res As IAsyncResult res = _
    cmd.BeginExecuteNonQuery()

' Perform other work.

' This blocks until the command completes.
Dim rowCount As Integer = _
    cmd.EndExecuteNonQuery( res )

The following code is the C# language equivalent:

// C#
ULCommand cmd = new ULCommand(
    "UPDATE Departments"
    + " SET DepartmentName = 'Engineering'"
    + " WHERE DepartmentID=100",
    conn
);

IAsyncResult res = cmd.BeginExecuteNonQuery();

// Perform other work.

// This blocks until the command completes.
int rowCount = cmd.EndExecuteNonQuery( res );

Poll the IsCompleted property of the IAsyncResult You can poll the IsCompleted property of the IAsyncResult. For example:

' Visual Basic
Dim cmd As ULCommand = new ULCommand( _
    "UPDATE Departments" _
    + " SET DepartmentName = 'Engineering'" _
    + " WHERE DepartmentID=100", _
    conn _
)

Dim res As IAsyncResult res = _
    cmd.BeginExecuteNonQuery()
While( !res.IsCompleted )
    ' Perform other work.
End While

' This blocks until the command completes.
Dim rowCount As Integer = _
    cmd.EndExecuteNonQuery( res )

The following code is the C# language equivalent:

// C#
ULCommand cmd = new ULCommand(
    "UPDATE Departments"
    + " SET DepartmentName = 'Engineering'"
    + " WHERE DepartmentID=100",
    conn
);

IAsyncResult res = cmd.BeginExecuteNonQuery();
while( !res.IsCompleted ) {
    // Perform other work.
}

// This blocks until the command completes.
int rowCount = cmd.EndExecuteNonQuery( res );

Use the IAsyncResult.AsyncWaitHandle property to get a synchronization object You can use the IAsyncResult.AsyncWaitHandle property to get a synchronization object, and wait on that. For example:

' Visual Basic
Dim cmd As ULCommand = new ULCommand( _
    "UPDATE Departments" _
    + " SET DepartmentName = 'Engineering'" _
    + " WHERE DepartmentID=100", _
    conn _
)
Dim res As IAsyncResult res = _
    cmd.BeginExecuteNonQuery()

' Perform other work.

Dim wh As WaitHandle = res.AsyncWaitHandle
wh.WaitOne()
' This does not block because the command is finished.
Dim rowCount As Integer = _
  cmd.EndExecuteNonQuery( res )

The following code is the C# language equivalent:

// C#
ULCommand cmd = new ULCommand(
    "UPDATE Departments"
    + " SET DepartmentName = 'Engineering'"
    + " WHERE DepartmentID=100",
    conn
  );
IAsyncResult res = cmd.BeginExecuteNonQuery();
// perform other work
WaitHandle wh = res.AsyncWaitHandle;
wh.WaitOne();
// This does not block because the command is finished.
int rowCount = cmd.EndExecuteNonQuery( res );

Specify a callback function when calling BeginExecuteNonQuery You can specify a callback function when calling BeginExecuteNonQuery. For example:

' Visual Basic
Private Sub callbackFunction(ByVal ar As IAsyncResult)
    Dim cmd As ULCommand = _
        CType(ar.AsyncState, ULCommand)
    ' This won't block since the command has completed.
    Dim rowCount As Integer = _
        cmd.EndExecuteNonQuery( res )
End Sub

' Elsewhere in the code
Private Sub DoStuff()
    Dim cmd As ULCommand = new ULCommand( _
        "UPDATE Departments" _
        + " SET DepartmentName = 'Engineering'" _
        + " WHERE DepartmentID=100", _
        conn _
    )
    Dim res As IAsyncResult = _
        cmd.BeginExecuteNonQuery( _
        callbackFunction, cmd _
    )
    ' Perform other work.  The callback function
    ' is called when the command completes.
End Sub

The following code is the C# language equivalent:

// C#
private void callbackFunction( IAsyncResult ar )
{
    ULCommand cmd = (ULCommand) ar.AsyncState;
    // This won't block since the command has completed.
    int rowCount = cmd.EndExecuteNonQuery();
}

// Elsewhere in the code
private void DoStuff()
{
    ULCommand cmd = new ULCommand(
        "UPDATE Departments"
        + " SET DepartmentName = 'Engineering'"
        + " WHERE DepartmentID=100",
        conn
    );
    IAsyncResult res = cmd.BeginExecuteNonQuery(
        callbackFunction, cmd
    );
    // Perform other work.  The callback function
    // is called when the command completes.
}

The callback function executes in a separate thread, so the usual caveats related to updating the user interface in a threaded program apply.

EndExecuteNonQuery method

Visual Basic syntax

C# syntax

Parameters

Returns

Exceptions

Remarks

See also