That's what I thought I was doing until I realized that to pass the references in a constructor, I needed to create a new instance of the Form1 class which meant I had two Form1s open. I couldn't figure out how to reference the "already open" instance of Form1. I still can't really....

Hmmm . . . .Delegates?

Okay, after messing with the code more, I realized that I created a new Form1 that wasn't visible and that instance of Form1 has the correctly updated variables f2TB1 and 2. Well, I really didn't want to create another instance of Form1, I just want to pass the data from textBoxes back to the existing instance of Form1.

I'll keep struggling along. Any thoughts would be appreciated.

I have a C# problem I've been struggling with for a week now. I can't figure it out. I've made a sample application to demonstrate my problem: how do I pass data between forms? I've read tons of posts/articles etc. about doing this, but I cant make it work. The application I'm writing has a bunch of forms, so when I'm done with one, I'd like to close it to free resources. On the close button event on these forms, I'd like to update variables...