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copied!<p>There seems to be a change in the Security Model in the runtime of .NET 4 (see <a href="http://social.msdn.microsoft.com/Forums/en/clr/thread/d8d5c4d2-a794-4e68-bc19-c6cdefa871b5" rel="nofollow noreferrer">Karel Zikmunds answer</a> and the <a href="http://blogs.msdn.com/b/shawnfa/archive/2009/11/12/differences-between-the-security-rule-sets.aspx" rel="nofollow noreferrer">.NET Security Blog</a> entry) that relies on the AllowPartiallyTrustedCallersAttribute.</p> <p>Karel also posted some options to solve it:</p> <blockquote> <p>You have these options:</p> <ol> <li>If you don't need APTCA, remove it.</li> <li>Run SecAnnotate tool from SDK and fix all transparency violations - <a href="http://blogs.msdn.com/b/shawnfa/archive/2009/11/18/using-secannotate-to-analyze-your-assemblies-for-transparency-violations-an-example.aspx" rel="nofollow noreferrer">http://blogs.msdn.com/b/shawnfa/archive/2009/11/18/using-secannotate-to-analyze-your-assemblies-for-transparency-violations-an-example.aspx</a>.</li> <li>Use Level1 attribute to switch your assembly to v2 security model - <a href="http://blogs.msdn.com/b/shawnfa/archive/2009/11/11/transparency-models-a-tale-of-two-levels.aspx" rel="nofollow noreferrer">http://blogs.msdn.com/b/shawnfa/archive/2009/11/11/transparency-models-a-tale-of-two-levels.aspx</a></li> </ol> </blockquote> <p>Another <a href="https://stackoverflow.com/questions/378895/operation-could-destabilize-the-runtime">post</a> on Stackoverflow that there might be an issue with Covariance and Contravariance in C#</p>

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