I have a solution with multi projects (VB.Net), but sometimes the build
output of one project get a wrong file which caused BadImageFormatException
at run time.

When you open the wrong file with ildasm, you can find that same class
appears more than once.

My question is: what's wrong with my projects? How can I solve this problem
because now there is another project starting to build wrong output too.

Thanks in advance!

BTW: If I post in wrong place, please point me the correct one.

Henry