Question

I have a one solution with 3 projects, three windowsforms.
I would like to have my main/startup project for form1 and which has 2 buttons. These should start form2/project2 and form3/project3. But how can I do this ??

Answer 1

You could set references to other projects and then try something like this:

Form2 frm2 = new Form2();
frm2.Show();

Form3 frm3 = new Form3();
frm3.Show();

or

YourClass2 cls2 = new YourClass2();
// Do what you need with it