C# Form Interoperability

Passing form values back and forth in .Net is conceptually tricky for programmers used to working in a non-OOP fashion Perhaps these programmers started out in languages such as Cobol and VB6. I know I did! (Well, if you add FORTRAN!).

If you are not used to thinking in an OOP way, you'll find passing values back and forth between the forms in your application confusing -- and not very well documented.

As a conceptual matter, you need to understand that a form is a class, and you are passing values back and forth to instances of your form classes. The trick is knowing how to refer to the instances. Once you have a name for an instance, you can easily use a variety of methods to pass values (using a public form class variable, using a property procedure, etc).

To start with, I'll go over the patently obvious so that we are sure we are "on the same page." This article explains the "out-of-the-box" form class code, and how you open a new form instance. With that under our collective belts, we can move on to the general pattern for passing information between specific form instances.

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