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Launch a window with defined XAML

<Window x:Class="WpfApplication1.MainWindow"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"      Title="Simple XAMl Viewer" Height="338" Width="1041"      Loaded="Window_Loaded" Closed="Window_Closed" WindowStartupLocation="CenterScreen" >   <DockPanel  LastChildFill="True" >     <Button DockPanel.Dock="Top"  Name = "btnViewXaml" Width="100" Height="40"               Content ="View Xaml" Click="btnViewXaml_Click" />     <TextBox AcceptsReturn ="True" Name ="txtXamlData"        BorderBrush ="Blue" VerticalScrollBarVisibility="Auto" AcceptsTab="True" TextDecorations="None">     </TextBox>   </DockPanel> </Window> //File:Window.xaml.cs using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation; using System.Windows.Shapes; using System.IO; using System.Windows.Markup; namespace WpfApplication1 {   public partial class MainWindow : Window   {     public MainWindow()     {       InitializeComponent();     }     private void btnViewXaml_Click(object sender, RoutedEventArgs e)     {       File.WriteAllText("YourXaml.xaml", txtXamlData.Text);       Window myWindow = null;       try       {         using (Stream sr = File.Open("YourXaml.xaml", FileMode.Open))         {           myWindow = (Window)XamlReader.Load(sr);           myWindow.ShowDialog();         }       }       catch (Exception ex)       { MessageBox.Show(ex.Message); }     }     private void Window_Loaded(object sender, RoutedEventArgs e)     {         txtXamlData.Text =         "<Window xmlns=\"http://schemas.microsoft.com"         + "/winfx/2006/xaml/presentation\"\n"         + "xmlns:x=\"http://schemas.microsoft.com/winfx/2006/xaml\""         + " Height =\"400\" Width =\"500\" WindowStartupLocation=\"CenterScreen\">\n"         + "<StackPanel>\n"         + "</StackPanel>\n"         + "</Window>";     }     private void Window_Closed(object sender, EventArgs e)     {       File.WriteAllText("YourXaml.xaml", txtXamlData.Text);     }   } }