Form Not Showing Up (C#)

This probably has a really simple solution to it, but I can't figure out what's wrong.

I've added a new form to my project in C#, and I'm trying to access the newly added form from an already existing form:

        frmSearch f5 = new frmSearch();
        f5.Show();

The problem is that, the form's name doesn't even come up as I'm typing it in the other form. And I've checked the name to make sure it was correct, etc.

How can I fix this?