Lorin Thwaits

Do you have arcane CS0006 errors haunting you, either in 1.1 or 2.0?  Something like this:

[No relevant source lines]

Additional symptoms: when you first build the app it works fine, but then when rebuilding it always comes up with this error.  Well, I know of three major reasons for this to occur:

1. You've got a signed assembly (DLL) that you haven't installed in the GAC.
2. You're using impersonation (via in web.config) and have not installed your DLL to the GAC.
3. You have an assembly with a strong name properly installed in the GAC, but have now recompiled and thus have a new version.  You have then deleted the older one, leaving the CLR still looking for the older version based on its specific strong name.

For reasons #1 and #2, simply install your assembly in the GAC.

As a sidenote for reason #2, if it's impersonation you're after then you may want to check out Michele's excellent article promoting impersonation on demand:
http://www.theserverside.net/articles/showarticle.tss?id=SandboxingComponents

If you're facing reason #3 from the list, version trouble, then here's a good article on using publisher policy to get around the issue:

http://msdn.microsoft.com/library/en-us/cpguide/html/cpconassemblyversionredirection.asp

And if that's confusing then you may want to start with this introductory article on versioning:
http://msdn.microsoft.com/library/en-us/dndotnet/html/managevers.asp

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