如何在AJAX回发后将数据返回给ASP.NET中的客户端？

I have a simple question - I use update panel with custom server control inside. I call __doPostBack from javascript and RaisePostBackEvent on the server fires (I implement IPostBackEventHandler). This is client to server call. Could I return data back to the client (after this partial postback)? What is the best way to achieve this?I have a simple question - I use update panel w