WPF C#

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="AnimateRadialGradient" Height="300" Width="300">
  
    
      
        
          
                                                       RepeatBehavior="Forever" >
              
              
              
              
            
                          To="Black"  Duration="0:0:10"
              AutoReverse="True" RepeatBehavior="Forever">
          

        

      

    
  

    
      
        
                       RadiusX="1" RadiusY="1" GradientOrigin="0.7,0.3">