Changing the assembly for the RadControls should be followed by adding a Binding Redirect
for this assembly in the web.config
Please, follow the instructions from the User Manual
section Upgrading RadControls
, point 5.
Take into consideration the fact that the example is for one control.
Since you want to change all RadControls you need to use the Telerik.Web.UI.dll
I hope this helps.
Let us know if more instructions are needed.
the Telerik team
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