System.Net.HttpWebRequest.HttpWebRequest.BeginGetRequestStream C# (CSharp) Method

		public override IAsyncResult BeginGetRequestStream (AsyncCallback callback, object state) 
		{
			if (Aborted)
				throw new WebException ("The request was canceled.", WebExceptionStatus.RequestCanceled);

			bool send = !(method == "GET" || method == "CONNECT" || method == "HEAD" ||
					method == "TRACE");
			if (method == null || !send)
				throw new ProtocolViolationException ("Cannot send data when method is: " + method);

			if (contentLength == -1 && !sendChunked && !allowBuffering && KeepAlive)
				throw new ProtocolViolationException ("Content-Length not set");

			string transferEncoding = TransferEncoding;
			if (!sendChunked && transferEncoding != null && transferEncoding.Trim () != "")
				throw new ProtocolViolationException ("SendChunked should be true.");

			lock (locker)
			{
				if (asyncWrite != null) {
					throw new InvalidOperationException ("Cannot re-call start of asynchronous " +
								"method while a previous call is still in progress.");
				}
	
				asyncWrite = new WebAsyncResult (this, callback, state);
				initialMethod = method;
				if (haveRequest) {
					if (writeStream != null) {
						asyncWrite.SetCompleted (true, writeStream);
						asyncWrite.DoCallback ();
						return asyncWrite;
					}
				}
				
				gotRequestStream = true;
				WebAsyncResult result = asyncWrite;
				if (!requestSent) {
					requestSent = true;
					redirects = 0;
					servicePoint = GetServicePoint ();
					abortHandler = servicePoint.SendRequest (this, connectionGroup);
				}
				return result;
			}
		}