title: How can I implement technically the described proposed client/server model
body: <p>I want to implement a simple client/server model in my application. Client will send a file to server and server will convert it and sent back converted file. But problem is that How can I implement the scenario so that server tell the client periodically about the status of conversion.
  In my case it is difficult that client asks the server about status update.</p>
  
  <p><strong>Part of the image in red is asked. How can I implement it in C# code.</strong></p>
  
  <p><img src="https://dl.dropboxusercontent.com/u/61738068/Scene.png" alt="Image of [proposed model"></p>