An assembly must have a 'dll' extension in order to be referenced???

And how did I get such a useful error you might ask?  By trying to add a reference to a project that is in the same solution in VS.Net 2003.  The project I'm trying to reference is a class library and when I open the project by itself, it builds perfectly fine.

I've got 3 different class library projects added to this solution of mine and 2 of them added as references just fine, it's this 3rd one that's giving me trouble.  Can anyone offer a suggestion as to what to check for this?

I can workaround it for now by just adding the .dll itself, but I'd rather have the project in the same solution for ease of debugging...

Comments

• Anonymous
  February 25, 2005
  You've built it as a "exe" assembly, not a "library" assembly. Change the project properties. Stupid VS.NET bug (IMO).

• Anonymous
  February 25, 2005
  The project properties are set to build it as a .dllI had checked that already. :) Thanks for the suggestion however.

• Anonymous
  June 15, 2005
  The comment has been removed

• Anonymous
  July 10, 2006
  Thanks Dane!
  
  BTW, you can delete the guid in the csproj file and VS with generate a new one for you.
  
  

• Anonymous
  January 22, 2007
  Thanks Dane - your fix has just sorted as well!

• Anonymous
  June 19, 2007
  > two projects with the same guid thx Dane!

• Anonymous
  August 23, 2007
  You've built it as a "exe" assembly, not a "library" assembly. Change the project properties. Stupid VS.NET bug (IMO). February 25, 2005 4:30 PM THANKS