In this post we will talk about the effects of a particular security enhancement in CLR 4.0 Beta 1 and how it affects working with AJAX Control Toolkit in Visual Studio 10 Beta 1 and possibly other 3-rd party assemblies. The security enhancement in question is the way CLR 4.0 treats assemblies that came from a remote source (e.g., downloaded from the Internet or copied from a file share of another computer). Prior to CLR 4.0, if such assembly was copied to a local drive on your computer, CLR would treat it as a trusted assembly coming from My Computer zone. This is different from how Windows was treating such assemblies. Downloaded assemblies are marked with a special ?Internet? bit and should not be trusted unless a user explicitly grants trust...(read more) ...
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