public void Exit()
        {
            if (Environment.OSVersion.Version.Major < 8)
            {
                System.Reflection.Assembly asmb = System.Reflection.Assembly.Load("Microsoft.Xna.Framework, Version=4.0.0.0, Culture=neutral, PublicKeyToken=842cf8be1de50553");
                asmb = System.Reflection.Assembly.Load("Microsoft.Xna.Framework.Game, Version=4.0.0.0, Culture=neutral, PublicKeyToken=842cf8be1de50553");
                Type type = asmb.GetType("Microsoft.Xna.Framework.Game");
                object obj = type.GetConstructor(new Type[] { }).Invoke(new object[] { });
                type.GetMethod("Exit").Invoke(obj, new object[] { });
            }
            else
            {
                Type type = Application.Current.GetType();
                type.GetMethod("Terminate").Invoke(Application.Current, new object[] { });
            }
        }