how to use/migrate a dll (built by me) in silverlight?

Question

I have a class library built on .net 3.5, I wanted to use it in a silverlight project and it told me that I must build it against silverlight runtime, anybody knows how to do this ?
can I migrate it, or should I create a new silverlight project and rewrite it or something ?

Answer 1

You need to create a Silverlight Class Library:

_{(source: c-sharpcorner.com)}