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Separate design assembly is not registered correctly


Assume we have controls.dll and in the same folder c:\temp, running
toolbox.exe /vs2008 /installdesktop C:\temp\controls.dll MyControls
does install the controls to toolbox, but the customized design assembly ( is not registered at all.


lextm wrote Aug 12, 2012 at 6:07 AM

After some investigation, this issue is caused by Visual Studio itself. Visual Studio tries to load the design time support assembly from GAC instead of the original directory.

So except calling toolbox.exe to register controls in Visual Studio, the assemblies should also be registered to GAC manually.

wrote Feb 13, 2013 at 11:17 PM