How do I create a Borderless Window in WPF ?

To make the window display without this gray border, you need to set the ‘ResizeMode’ property of the window to ’NoResize’.

[XAML]
<Window x:Class='BorderlessWindow.Window1'
 xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
 xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
 Title='BorderlessWindow' Height='200' Width='200' 
 Background='White' WindowStyle='None' ResizeMode='NoResize'>
 <Border Padding='5' BorderBrush='#feca00' 
	 BorderThickness='3' Width='150' Height='150'>
 <TextBlock>Learn WPF!</TextBlock>
 </Border>
</Window>