Can I send webrequest from specified ip address with .NET Framework?

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You need to use the ServicePoint.BindIPEndPointDelegate callback.

http://blogs.msdn.com/b/malarch/archive/2005/09/13/466664.aspx

The delegate is called before the socket associated with the httpwebrequest attempts to connect to the remote end. 

public static IPEndPoint BindIPEndPointCallback(ServicePoint servicePoint, IPEndPoint remoteEndPoint, int retryCount)
{
    Console.WriteLine("BindIPEndpoint called");
      return new IPEndPoint(IPAddress.Any,5000);

}

public static void Main()
{

    HttpWebRequest request = (HttpWebRequest) WebRequest.Create("http://MyServer");

    request.ServicePoint.BindIPEndPointDelegate = new BindIPEndPoint(BindIPEndPointCallback);

    HttpWebResponse response = (HttpWebResponse)request.GetResponse();

}

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