HttpWebRequest.EndGetRequestStream Method (IAsyncResult)


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

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

public override Stream EndGetRequestStream(
	IAsyncResult asyncResult


Type: System.IAsyncResult

The pending request for a stream.

Return Value

Type: System.IO.Stream

A Stream to use to write request data.

Exception Condition

asyncResult is null.


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.


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 in the .NET Framework.

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

using System;
using System.Net;
using System.IO;
using System.Text;
using System.Threading;

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

    public static void Main(string[] args)

        // Create a new HttpWebRequest object.
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create("");

        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
        request.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), 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. 

    private static void GetRequestStreamCallback(IAsyncResult asynchronousResult)
        HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;

        // 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.
        byte[] byteArray = Encoding.UTF8.GetBytes(postData);

        // Write to the request stream.
        postStream.Write(byteArray, 0, postData.Length);

        // Start the asynchronous operation to get the response
        request.BeginGetResponse(new AsyncCallback(GetResponseCallback), request);

    private static void GetResponseCallback(IAsyncResult asynchronousResult)
        HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;

        // End the operation
        HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);
        Stream streamResponse = response.GetResponseStream();
        StreamReader streamRead = new StreamReader(streamResponse);
        string responseString = streamRead.ReadToEnd();
        // Close the stream object

        // Release the HttpWebResponse

Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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