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Create a non-rectangular window

<Window x:Class="NonRectangularWindowSample.NonRectangularWindow"   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"   Title="NonRectangularWindowSample" SizeToContent="WidthAndHeight"    MouseLeftButtonDown="NonRectangularWindow_MouseLeftButtonDown"   WindowStyle="None"    AllowsTransparency="True"    Background="Transparent">   <Canvas Width="200" Height="200" >     <Path Stroke="DarkGray" StrokeThickness="2">       <Path.Fill>         <LinearGradientBrush StartPoint="0.2,0" EndPoint="0.8,1" >           <GradientStop Color="White"  Offset="0"></GradientStop>           <GradientStop Color="Red"  Offset="0.45"></GradientStop>           <GradientStop Color="LightBlue" Offset="0.9"></GradientStop>           <GradientStop Color="Gray" Offset="1"></GradientStop>         </LinearGradientBrush>       </Path.Fill>       <Path.Data>         <PathGeometry>           <PathFigure StartPoint="40,20" IsClosed="True">             <LineSegment Point="160,20"></LineSegment>             <ArcSegment Point="180,40" Size="20,20" SweepDirection="Clockwise"></ArcSegment>             <LineSegment Point="180,80"></LineSegment>             <ArcSegment Point="160,100" Size="20,20" SweepDirection="Clockwise"></ArcSegment>             <LineSegment Point="90,100"></LineSegment>             <ArcSegment Point="20,80" Size="20,20" SweepDirection="Clockwise"></ArcSegment>             <LineSegment Point="20,40"></LineSegment>             <ArcSegment Point="40,20" Size="20,20" SweepDirection="Clockwise"></ArcSegment>           </PathFigure>         </PathGeometry>       </Path.Data>     </Path>     <Label Width="200" Height="120" FontSize="15" HorizontalContentAlignment="Center" VerticalContentAlignment="Center">Drag Me</Label>     <Button Canvas.Left="155" Canvas.Top="30" Click="closeButtonRectangle_Click">       <Button.Template>         <ControlTemplate>           <Canvas>             <Rectangle Width="15" Height="15" Stroke="Black" RadiusX="3" RadiusY="3">               <Rectangle.Fill>                 <SolidColorBrush x:Name="myAnimatedBrush" Color="Red" />               </Rectangle.Fill>             </Rectangle>             <Line X1="3" Y1="3" X2="12" Y2="12" Stroke="White" StrokeThickness="2"></Line>             <Line X1="12" Y1="3" X2="3" Y2="12" Stroke="White" StrokeThickness="2"></Line>           </Canvas>         </ControlTemplate>       </Button.Template>     </Button>   </Canvas> </Window> //File:Window.xaml.cs using System; using System.Windows; using System.Windows.Input; namespace NonRectangularWindowSample {   public partial class NonRectangularWindow : Window {     public NonRectangularWindow() {       InitializeComponent();     }     void NonRectangularWindow_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) {       this.DragMove();     }     void closeButtonRectangle_Click(object sender, RoutedEventArgs e) {       this.Close();     }   } }