I am using Telerik controls in Dotnetnuke custom modules, A problem has happened to all ajax controls and the result is A postback request every time instead of Ajax Request.
In Firebug i can see,
Sys.InvalidOperationException: Sys.InvalidOperationException: The PageRequestManager cannot be initialized more than once.
the exception source is Telerik.Web.UI.WebResource.axd
,
I know it's not Telerik itself but a conflict between Telerik and DOTNETNUKE AJAX, however i couldn't know where.
Any ideas to catch this exception and handle it?
The problem was using
telerik:RadScriptManager
I've used the following code to get the Excel import for RadGrid working,
The solution is to delete the extra RadScriptManager, since Dotnetnuke already has one.