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copied!<p>In general, that should <em>not</em> be the case:</p> <blockquote> <p><a href="http://msdn.microsoft.com/en-us/library/ff602939.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/ff602939.aspx</a></p> <p>Backward compatibility means that an application developed for a particular version of a platform will run on later versions of that platform. The .NET Framework tries to maximize backward compatibility: Source code written for one version of the .NET Framework should compile on later versions of the .NET Framework, and binaries that run on one version of the .NET Framework should behave identically on later versions of the .NET Framework.</p> <p>...</p> <p>The .NET Framework 4 is backward-compatible with applications that were built with the .NET Framework versions 1.1, 2.0, 3.0, and 3.5. In other words, applications and components built with previous versions of the .NET Framework will work on the .NET Framework 4.</p> </blockquote> <p>SUGGESTIONS:</p> <p>1) Read these links:</p> <ul> <li><p><a href="http://msdn.microsoft.com/en-us/library/ff602939.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/ff602939.aspx</a></p></li> <li><p><a href="http://msdn.microsoft.com/en-us/library/dd889541.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/dd889541.aspx</a></p></li> <li><p><a href="http://msdn.microsoft.com/en-us/library/ee461502.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/ee461502.aspx</a></p></li> </ul> <p>2) See if you can reproduce the problem with a minimal .Net 3.5 Winforms app</p> <p>3) Cut/paste the exact error message, and any relevant code (e.g. from your standalone app)</p> <p>4) Failing all else, consider adding <code><startup useLegacyV2RuntimeActivationPolicy="true" ></code> to your CLR startup configuration. I would <em>not</em> recommend this as anything but a temporary workaround:</p> <ul> <li><a href="http://msdn.microsoft.com/en-us/library/bbx34a2h.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/bbx34a2h.aspx</a></li> </ul>

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