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Listen to window resize event

using System; using System.Windows; using System.Windows.Input; using System.Windows.Media;     class MainClass: Window     {         LinearGradientBrush brush;         [STAThread]         public static void Main()         {             Application app = new Application();             app.Run(new MainClass());         }         public MainClass()         {             Title = "title";             SizeChanged += WindowOnSizeChanged;             brush = new LinearGradientBrush(Colors.Red, Colors.Blue, 0);             brush.MappingMode = BrushMappingMode.Absolute;             Background = brush;         }         void WindowOnSizeChanged(object sender, SizeChangedEventArgs args)         {             double width = 200;             double height = 200;             Point ptCenter = new Point(width / 3, height / 3);             Vector vectDiag = new Vector(width, -height);             Vector vectPerp = new Vector(vectDiag.Y, -vectDiag.X);             vectPerp.Normalize();             vectPerp *= width * height / vectDiag.Length;             brush.StartPoint = ptCenter + vectPerp;             brush.EndPoint = ptCenter - vectPerp;         }     }