Question

How an AJAX application like those written in ASP.NET AJAX informs client the events fired in server? I meant some application like Gmail. Gmail tells the client whenever a new email has been arrived. I’m very interested how is done in ASP.NET AJAX using UpdatePanel. I know UpdatePanel has a Triggers property, but it works only with Controls events not events of my own classes.

Answer 1

Ajax applications check server state continously to achieve this effect. They always work as clients and cannot receive requests from server.