“Global variable” in Visual C#

Question

I have made the Graph class, and i want to simulate a distribution network. The Graph works 100%. But, i want to use that same struct/class in all my application! For example: I

Answer 1

Give the forms a reference to the Graph in their constructor.

 Graph g = new Graph();
 Form1 f1 = new Form1(g);
 Form2 f2 = new Form2(g);

Then both forms are working with the same graph.