Telerik Controls Are Incompatible with the Ajax Control Toolkit
Environment
| Product | Progress® Telerik® UI for ASP.NET AJAX |
Description
When working with Telerik UI for ASP.NET AJAX, I get an error that the AJAX Toolkit Team announced the standard script manager can no longer be used with their controls.
Error Message
You must use the ToolkitScriptManager instead of the ScriptManager with the Ajax Control Toolkit.
Cause
Since the RadScriptManager is based on the standard asp:ScriptManager, this change in the Ajax Control Toolkit makes it incompatible.
Solution
To use both Telerik UI and AJAX Toolkit control bundles simultaneously within the same project, you have to use the ToolkitScriptManager. Upon using the toolkit manager, you can come across an error when using an UpdatePanel. This error is due to the ToolkitScriptManager having a bug with script combining. The bug is now fixed within a day after the release:
If the problem is reproduced in the release mode when the scripts are combined and after an AJAX request, use the temporary workaround—set the CombineScripts property in the ToolkitScriptManager tag to false. The issue is not reproducible into debug mode, because the script combining logic works only in release mode.
For additional information about the Telerik controls and AJAX Control Toolkit history, refer to the troubleshooting scenarios of the RadScriptManager.