I've been seeing many developers in the forums asking: How can I display a message box from the server (code behind)? How can I customize the javascript confirm and alert popup? How can I display a message box like in windows application? As some of you may already know that displaying a pop-up message box has always been a pain for most developers in web programming. Everyone has probably used the Page.ClientScript.RegisterS... or the ScriptManager.RegisterClien... method to call ......