Suppress the Default JavaScript Error When Doing an Ajax Postback

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void Application_Start(object sender, EventArgs e) { // Code that runs on application startup } void Application_End(object sender, EventArgs e) { // Code that runs on application shutdown } void Application_Error(object sender, EventArgs e) { try { if (HttpContext.Current.Handler is Page && Request.HttpMethod == "POST") { var p = (Page)HttpContext.Current.Handler; var m = ScriptManager.GetCurrent(p); if (m != null && m.IsInAsyncPostBack) { string script = "alert('There was an error and our technical staff has been notified.\\nPlease try again later.');"; Response.ContentType = "text/plain"; Response.Write(script.Length + "|scriptBlock|ScriptContentNoTags|" + script + "|"); Response.End(); } else { Server.Transfer("~/500.aspx"); } } else if (HttpContext.Current.Handler is Page) { Server.Transfer("~/500.aspx"); } } catch { } }