I tried making a user.dll encapsulation userauthentication on a web-project of mine. It worked fine, but now I want to use the same logic on another project. Do I have to copy my first dll to the new projects bin-directory, or is it possible to create a bin/ on the servers root-dir.?<BR><BR>Any other suggestion? I don`t want to have to maintain 34 versions of the same dll...<BR><BR>thx.Look into adding it to the GAC. Then you can access that dll from any application. You need to generate a strong name for the dll then add it. For more info check out this link:<BR>http://www.aspzone.com/articles/john/GAC/