Making a form "inactive"

I have a project with two forms in it, one is the main form and another one is a progress bar form. I would like to have the progress form always on top when it's shown at the main form to remain inactive in the background so the user can't switch between them. Any easy way? Thanks

Set the main form's Enabled property to false.

Thank you! I just did not realize it was that easy. I skipped through that property the last time I tried to do it, thinking it was not what I wanted.