FtpWebRequest.EndGetRequestStream Method

Note: This method is new in the .NET Framework version 2.0.

Ends a pending asynchronous operation started with BeginGetRequestStream.

Namespace: System.Net
Assembly: System (in system.dll)

public override Stream EndGetRequestStream (
	IAsyncResult asyncResult
public Stream EndGetRequestStream (
	IAsyncResult asyncResult
public override function EndGetRequestStream (
	asyncResult : IAsyncResult
) : Stream



The IAsyncResult object that was returned when the operation started.

Return Value

A writable Stream instance associated with this instance.

Exception typeCondition


asyncResult is a null reference (Nothing in Visual Basic).


asyncResult was not obtained by calling BeginGetRequestStream.


This method was already called for the operation identified by asyncResult.

If the operation has not completed, the EndGetRequestStream method blocks until the operation completes. To determine whether the operation has completed, check the IsCompleted property before calling EndGetRequestStream.

In addition to the exceptions noted in "Exceptions," EndGetRequestStream rethrows exceptions that were thrown while opening the stream for writing.


This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing.

The following code example demonstrates ending an asynchronous operation to get a request's stream. This code example is part of a larger example provided for the FtpWebRequest class overview.

private static void EndGetStreamCallback(IAsyncResult ar)
    FtpState state = (FtpState) ar.AsyncState;
    Stream requestStream = null;
    // End the asynchronous call to get the request stream.
        requestStream = state.Request.EndGetRequestStream(ar);
        // Copy the file contents to the request stream.
        const int bufferLength = 2048;
        byte[] buffer = new byte[bufferLength];
        int count = 0;
        int readBytes = 0;
        FileStream stream = File.OpenRead(state.FileName);
            readBytes = stream.Read(buffer, 0, bufferLength);
            requestStream.Write(buffer, 0, readBytes);
            count += readBytes;
        while (readBytes != 0);
        Console.WriteLine ("Writing {0} bytes to the stream.", count);
        // IMPORTANT: Close the request stream before sending the request.
        // Asynchronously get the response to the upload request.
            new AsyncCallback (EndGetResponseCallback), 
    // Return exceptions to the main application thread.
    catch (Exception e)
        Console.WriteLine("Could not get the request stream.");
        state.OperationException = e;

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0