How do i add a background worker?

Hello

I have not worked with the backgroundworker before and I found a few articles on it online. The frustrating part is that try to use it in VB.net 2003  and the code does nto work because the backgroundworker is not defined.

when I declare an instance of the class it says it  the backgroundworker type is not defined.

How do I add it?

I tried adding reference but I can not find it in a refernce and I tried adding tools tomy tool box but can not find it either.

I see many samples of codes but I can not make them work becuase I do not have the class.

Is this only for visual basic 2005 express edition?

I would greatly appreciate your help.

Thanks