Question

I have VS2012, by using C# i created two WPF, and I added a button to first WPF to open the second WPF. But VS couldnt found the Window ( I wrote this:

 MainWindow_2 win2 = new MainWindow_2().Show();
 win2.Show();

and it couldnt find MainWindow_2)

I tried to add a namespace “DXWPFApplication3” to another Window. I tried:

using DXWPFApplication3;

and it gives error “type or namespace name could not be found”

How can i add a namespace?

(In Project folder those two WPFs in different folders)

Answer 1

It sounds like you need to add a reference to the first project.
Open the project up in Solution Explorer, right click on the References and click “Add Reference”. In that dialog, pick projects and add the project that has the DXWPFApplication3 namespace. That should fix the problem.