HttpWebRequest.EndGetRequestStream Method

Ends an asynchronous request for a Stream object to use to write data.

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

Public Overrides Function EndGetRequestStream ( _
	asyncResult As IAsyncResult _
) As Stream
Dim instance As HttpWebRequest
Dim asyncResult As IAsyncResult
Dim returnValue As Stream

returnValue = instance.EndGetRequestStream(asyncResult)
public Stream EndGetRequestStream (
	IAsyncResult asyncResult
public override function EndGetRequestStream (
	asyncResult : IAsyncResult
) : Stream



The pending request for a stream.

Return Value

A Stream to use to write request data.

Exception typeCondition


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


The request did not complete, and no stream is available.


asyncResult was not returned by the current instance from a call to BeginGetRequestStream.


This method was called previously using asyncResult.


Abort was previously called.


An error occurred while processing the request.

The EndGetRequestStream method completes an asynchronous request for a stream that was started by the BeginGetRequestStream method. After the Stream object has been returned, you can send data with the HttpWebRequest by using the Stream.Write method.


You must set the value of the ContentLength property before writing data to the stream.

Caution noteCaution

You must call the Stream.Close method to close the stream and release the connection for reuse. Failure to close the stream causes your application to run out of connections.


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

The following code example uses the EndGetRequestStream method to end an asynchronous request for a stream instance.

Imports System
Imports System.Net
Imports System.IO
Imports System.Text
Imports System.Threading
Imports Microsoft.VisualBasic

Class HttpWebRequestBeginGetRequest
    Public Shared allDone As New ManualResetEvent(False)

    Shared Sub Main()

        ' Create a new HttpWebRequest object.
      '  Dim request As HttpWebRequest = CType(WebRequest.Create(""), _
       '         HttpWebRequest)
Dim request As HttpWebRequest = CType(WebRequest.Create("http://localhost/test/PostAccepter.aspx"), _
        ' Set the ContentType property.
        request.ContentType = "application/x-www-form-urlencoded"
        '  Set the Method property to 'POST' to post data to the URI.
        request.Method = "POST"
        ' Start the asynchronous operation.		
        Dim result As IAsyncResult = _
            CType(request.BeginGetRequestStream(AddressOf ReadCallback, request), IAsyncResult)
        ' Keep the main thread from continuing while the asynchronous
        ' operation completes. A real world application
        ' could do something useful such as updating its user interface. 
        '  Get the response.
        Dim response As HttpWebResponse = CType(request.GetResponse(), HttpWebResponse)
        Dim streamResponse As Stream = response.GetResponseStream()
        Dim streamRead As New StreamReader(streamResponse)
        Dim responseString As String = streamRead.ReadToEnd()
        ' Close Stream object.

        ' Release the HttpWebResponse.
    End Sub ' Main

    Private Shared Sub ReadCallback(ByVal asynchronousResult As IAsyncResult)
        Dim request As HttpWebRequest = CType(asynchronousResult.AsyncState, HttpWebRequest)
        ' End the operation.
        Dim postStream As Stream = request.EndGetRequestStream(asynchronousResult)
        Console.WriteLine("Please enter the input data to be posted:")
        Dim postData As [String] = Console.ReadLine()
        '  Convert the string into byte array.
        Dim byteArray As Byte() = Encoding.UTF8.GetBytes(postData)
        ' Write to the stream.
        postStream.Write(byteArray, 0, postData.Length)
    End Sub ' ReadCallback

End Class ' HttpWebRequest_BeginGetRequest

import System.*;
import System.Net.*;
import System.IO.*;
import System.Text.*;
import System.Threading.*;

class HttpWebRequestBeginGetRequest
    public static ManualResetEvent allDone = new ManualResetEvent(false);

    public static void main(String[] args)
        // Create a new HttpWebRequest object.
        HttpWebRequest request = (HttpWebRequest)(WebRequest.Create(
        // Set the ContentType property. 
        // Set the Method property to 'POST' to post data to the URI.
        // Start the asynchronous operation.    
        request.BeginGetRequestStream(new AsyncCallback(ReadCallback), request);
        // Keep the main thread from continuing while the asynchronous
        // operation completes. A real world application
        // could do something useful such as updating its user interface. 

        // Get the response.
        HttpWebResponse response = (HttpWebResponse)(request.GetResponse());
        Stream streamResponse = response.GetResponseStream();
        StreamReader streamRead = new StreamReader(streamResponse);
        String responseString = streamRead.ReadToEnd();

        // Close the stream object.
        // Release the HttpWebResponse.
    } //main

    private static void ReadCallback(IAsyncResult asynchronousResult)
        HttpWebRequest request = (HttpWebRequest)
        // End the operation.
        Stream postStream = request.EndGetRequestStream(asynchronousResult);
        Console.WriteLine("Please enter the input data to be posted:");
        String postData = Console.ReadLine();
        // Convert the string into a byte array.
        ubyte byteArray[] = Encoding.get_UTF8().GetBytes(postData);
        // Write to the request stream.
        postStream.Write(byteArray, 0, postData.get_Length());
    } //ReadCallback
} //HttpWebRequestBeginGetRequest 

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, 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, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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