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    <p>You can use either Native ASP.Net approach or Silverlight approach to develop the good looking chat application.</p> <p>The only concern is how your application is responsive to the end user. Here <strong>responsive</strong> means how the system let the user to feel the presense of other users and real time chat experience. This is refrenced sometime as <strong>really real time</strong>. (Like gmail &amp; facebook webchat allows the user to see the user presense saying "user is typing or idle")</p> <p>You can achive this level of realtime appearance using both these technologies. But implementation are little different.</p> <p>In order to achive this, you must implement a duplex communication between the browser and server. So then server will notify the client if there is any response from other user or his presense.</p> <p><strong>In ASP.Net way:</strong></p> <ul> <li>This is been completely controlled by AJAX.</li> <li>You have to simulate the Duplex communication using AJAX. <strong>By default HTTP doesnt support duplex</strong>. Its oneway. It only responses to client request. It cant directly invoke client method .</li> <li>There are existing techniques available to achive this. One of the approach is called <strong>COMET</strong> or <strong>ReverseAJAX</strong>.</li> <li>Its nothing but the long living AJAX calls, and will respond to the client if there is a expected event happening in server side, otherwise it stays calm. This <a href="http://en.wikipedia.org/wiki/Comet_(programming)" rel="nofollow noreferrer">Comet (programming)</a> wikipedia article explains more about the approach.</li> </ul> <p><strong>In SilverLight way:</strong></p> <ul> <li>Silverlight gives much better User experience compared to normal HTML pages. </li> <li>By using SL, you can make use of <a href="http://msdn.microsoft.com/en-us/library/ms731064.aspx" rel="nofollow noreferrer">WCF Duplex services</a> to implement the server push technique. As per MSDN, it says</li> </ul> <blockquote> <p>A duplex service contract is a message exchange pattern in which both endpoints can send messages to the other independently. A duplex service, therefore, can send messages back to the client endpoint, providing event-like behavior</p> </blockquote> <ul> <li>Here the <a href="http://weblogs.asp.net/dwahlin/archive/2008/06/19/pushing-data-to-a-silverlight-client-with-a-wcf-duplex-service-part-ii.aspx" rel="nofollow noreferrer">nice example</a> implementing duplex in SL.</li> </ul> <p>Hope this helps</p>
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    1. COHi Ramesh, thanks for the detail. Do you know if wsDualHttpBinding can be used for an ASP.NET application, or only SL supports Duplex services?
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    2. COThe duplex could potentially be used on the ASP.NET server side only but not directly from the client. Have fun and good luck.
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    3. CO@Sean, as smallclell said we cant invoke the WCF from client side AJAX (cant invoke from js). so the better approach is COMET if you go ahead with asp.net. or WCF Duplex is better if you wanted to go ahead with SL.. check out the same topic here in SO http://stackoverflow.com/questions/1066336/wcf-asp-net-duplex-support-using-ajax
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