Invoking not working?

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C#

Just wondering, what is the point in invoking a method if it does not work? I have spent the past 7 hours trying to get it to work but had no luck. I dont get an error, it just simply does not work. here is my code.

delegate void StringParameterDelegate(string value);

void UpdateStatus(string value)
        {
            if (InvokeRequired)
            {
                // We're not in the UI thread, so we need to call BeginInvoke
                BeginInvoke(new StringParameterDelegate(UpdateStatus), new object[] { value });
                return;
            }
            // Must be on the UI thread if we've got this far
            rtbChat.Text = value;

        }

void OnReceive(IAsyncResult ar)
 {
     String content = String.Empty;
     StateObject state = (StateObject)ar.AsyncState;
     Socket handler = state.workSocket;
     int bytesRead;
     if (handler.Connected)
     {
         // Read data from the client socket.
         try
         {
             bytesRead = handler.EndReceive(ar);
             if (bytesRead > 0)
             {
             state.sb.Remove(0, state.sb.Length);
                 state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));
                 // Display Text in Rich Text Box
                 content = state.sb.ToString();
                 UpdateStatus(content);
                 handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0, new AsyncCallback(OnReceive), state);
             }
         }

         catch (SocketException socketException)
         {
             if (socketException.ErrorCode == 10054 || ((socketException.ErrorCode != 10004) && (socketException.ErrorCode != 10053)))
             {
                 handler.Close();
             }
         }
     }
 }

I am beginning to believe that it is not possible. No matter how I set up the invoke it simply does not update my richTextBox, if I set put a messageBoz.Show in the update status it works, but it never updates the richTextBox(rtbChat).

Any help would be greatly appriciated.
Thanks in advance.