You just need to add a link to the project for the project from which you want to call another project. Then you can do something like this. I have 2 different namespaces, but something like this should work.
namespace WpfApplication1
{
public partial class MainWindow : Window
{
WpfApplication2.MainWindow newForm;
public MainWindow()
{
InitializeComponent();
}
private void button1_Click(object sender, RoutedEventArgs e)
{
newForm = new WpfApplication2.MainWindow();
newForm.Show();
}
}
}
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