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open new form, close existing wpf form c#

This thread solve all realted questions which is generated on open new form, close existing wpf form c#. Also this thread solve other related thread like:

  • WPF Application still runs in background after closing.
  • My Windows Store app is still running in debug mode after I close it.
  • VS2012 Debugging fails on subsequent runs.
  • WPF Main application stops responding if a child window is being moved around.
  • Application doesn't exit if it creates a window which is not shown.
  • How main WPF window knows when secondary WPF window is closed.
  • When shutting down the application, not all windows are closed.
  • How to connect WPF Application project to Windows Game project?
  • Clarification on WPF Window.Show() and Window.Close() and how they work with Multiple Windows.
  • WPF App Doesn't Shut Down When Closing Main Window.

Now the solution of all thread is, following steps which is mentioned below:
Step-1 :   Add two new window in wpf solution explorer. like first.xaml and second.xaml 

Step-2 :  Add a button control in first window from the toolbox.

Step-3 : Add this code into your first.xaml.cs file.



        private void Button_Click(object sender, RoutedEventArgs e)
        {
            second sc = new second();
            sc.Owner = this;
            this.Hide();
            sc.ShowDialog();
        }

Step-4 :  Also add this code into your second.xaml.cs file.

protected override void OnClosed(EventArgs e)
        {
            base.OnClosed(e);
            Application.Current.Shutdown();
        }

Now, run your application, but first to set the start page from app.xaml file. 
How to set startup page in wpf:
1. Open app.xaml file; also set startupUri like

<Application x:Class="WpfApplication1.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             StartupUri="first.xaml">
    <Application.Resources>
         
    </Application.Resources>
</Application>

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