Parameters

callback

The AsyncCallback delegate.

state

An object containing state information for this asynchronous request.

Returns

An IAsyncResult that references the asynchronous request.

Exceptions

Type	Reason
NotSupportedException	This method is not overridden in the derived class.

Remarks

The WebRequest.BeginGetRequestStream(AsyncCallback, object) method starts an asynchronous request for a stream used to send data to an Internet resource. The callback method that implements the AsyncCallback delegate uses the WebRequest.EndGetRequestStream(IAsyncResult) method to return the request stream.

Note:

The System.Net.WebRequest class is an abstract class. The actual behavior of System.Net.WebRequest instances at run time is determined by the descendant class returned by the WebRequest.Create(Uri) method. For more information about default values and exceptions, see the documentation for the descendant classes, such as System.Net.HttpWebRequest and System.Net.FileWebRequest.

Requirements