Client Event Callback Manager in Whidbey. Saurabh Verma, from the .NET user group in New Delhi, writes “I tried the Client Event Callback in Whidbey. I ended by developing a chat application with mere 15 lines of code, that too without any Page Refresh. Microsoft did a good research and implemented the XML-HTTP callback in ASP.NET 2.0. Its a 4 step proccess for implementing a Client Callback without Page Refresh.” More …