[2.0] Pass data between forms?

[penagate]

Ah! At the moment I get a weird error when I try to use that, if I recall correctly the error says that I already have a ShowDialog instance running, or at least something similar to that.

ShowDialog causes the form to be displayed modally, which blocks access to other windows in the application. As such, you can only have one modal form open at any one time.

Could you please explain what you did with the .Save() method, and how it works?

That was was just a fictional example. (I couldn't think of a better one at the time.)
.NET 2.0 actually provides its own facility for saving application settings.
Using Settings in C#