Open Two Window at a time in WPF

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C#

WPF

Now I am working on WPF with C#. In WPF, Everyone knows when you run the code a window is open. I need to open two window at a time when I run the program. Please see this basic code of App.xaml :

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

From here we can see Application Form run the MainWindow by using StartupUri="MainWindow.xaml". So how can add another window ?? The purpose of my program is -When i will write in one window then the impact will show by another window.So please help me by providing some sample code.