The present version 2010.1.309 of RadControls for ASP.NET AJAX supports VS 2010/.NET 4 RC. We plan to publish the Q1 2010 SP1 release of the suite this week after the official launch of VS 2010/.NET 4 becomes a fact. With it we will announce support for the RTM version of the new Visual Studio and .NET framework.
the Telerik team
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