Linking a openGL project with a windows form in c sharp

Question

Actually i have two C# projects.Both of these projects are to be linked together.One project is GUI based,in this project I have a form  and there is a OK button in this form.Now i have the second project which i made using OpenGL in C#.Both the projects are different and each has a file named Program.cs which has the main function.Now on click of OK button in the GUI based project I need to open the file fromOpenGL project.How to do so?

Any Suggestions will be helpful.