using System;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media;
class MainClass: Window
{
[STAThread]
public static void Main()
{
Application app = new Application();
app.Run(new MainClass());
}
public MainClass()
{
Title = "title";
LinearGradientBrush brush = new LinearGradientBrush();
brush.StartPoint = new Point(0, 0);
brush.EndPoint = new Point(1, 0);
Background = brush;
brush.GradientStops.Add(new GradientStop(Colors.Red, 0));
brush.GradientStops.Add(new GradientStop(Colors.Indigo, .84));
brush.GradientStops.Add(new GradientStop(Colors.Violet, 1));
}
}