this is my first ASP.Net Project in Visual Studio 2010 (not the first in general). I wrote a lot of methods and now I want to design Users GUI. I put a Script Manager to the begin of my default.aspx (in a contentplaceholder) and want to use a updatepanel as I did earlier in Visual Studio 2008. So I drop an UpdatePanel from the AJAX Extensions toolbox on the site, but there is only a
rendering error with an unhandled exception shown.
Addionaly I registered Ajax Control Toolkit 4.0.
What is the difference between VS2008 and VS2010 for handling built in AJAX extensions? What could be the problem?
Thanks and best regards
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