Migration from ASP.NET to ASP.NET AJAX

[Sai Charan]

Hi Everyone,

I am facing some problem while Migration from ASP.NET to ASP.NET AJAX. I need some help from you. When I Replaced the classic directive <%@ Register Assembly="RadWindow.NET2" Namespace="Telerik.WebControls" TagPrefix="radW" %> with the new one of for ASP.NET AJAX :<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %> which i control I must and should I change? For example if replaced like above i must and should update RadAJAXManager other wise an exception is throwing Null Reference exception. Like this how many control must and should i change?

Here is Error

This error occurred when i have not updated RADAjaxManger control.

NullReferenceException: Object reference not set to an instance of an object.
Telerik.WebControls.RadAjaxUtils.RadControl.GetUpdatingUpdatePanel(Control target) +101
Telerik.WebControls.RadAjaxUtils.RadControl.IsInAjaxUpdatePanel(Control target) +50
Telerik.WebControls.RadAjaxUtils.RadControl.Page_PreRenderComplete(Object sender, EventArgs e) +21
System.EventHandler.Invoke(Object sender, EventArgs e) +0
System.Web.UI.Page.OnPreRenderComplete(EventArgs e) +8703326
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1029

Thanks in advance

--Sai Charan.M

[Sebastian]

Hello Sai,

To complete the migration process successfully, I suggest you refer to the individual controls' topics in the documentation which elaborate on this subject. Here are the relevant articles for RadAjax and RadWindow:

RadAjax
http://www.telerik.com/help/aspnet-ajax/ajax-radajax-for-asp.net-vs-radajax-prometheus.html

RadWindow
http://www.telerik.com/help/aspnet-ajax/window-overview-migrating-from-classic-to-prometheus.html

Best regards,
Sebastian
the Telerik team