How to add dll in c# project

Question

I am trying to add a [Science.dll] in my project which should be staright forward. But I am getting a problem. Can someone tell me why?

My C# projec

Answer 1

In the right hand column under your solution explorer, you can see next to the reference to "Science" its marked as a warning. Either that means it cant find it, or its objecting to it for some other reason. While this is the case and your code requires it (and its not just in the references list) it wont compile.

Please post the warning message, we can try help you further.