How to identify Async Postback in Page Load event ? abhisanto AJAX Interview Questions April 14, 2012 1 Minute How to identify Async Postback in Page Load event ? Async Postback is identified using IsInAsyncPostBack property of Script Manger i.e. ScriptManager.IsInAsyncPostBack Share this:TwitterFacebookLike this:Like Loading... Published April 14, 2012