Question

I have two separate project for example project1 and project2. Well i have a window1 in the project1 so how can i show this window1 from project2.

Answer 1

You just need to add a project reference to the project you want to call the other project from. You can then do something like this. I have 2 different Namespaces but something like this should work.

namespace WpfApplication1
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    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();  // or newForm.ShowDialog();
        }
    }
}