public Window1()
        {
            InitializeComponent();
        }
        int i;

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            i++;
            textBox.Text = i.ToString()+") "+  GC.GetTotalMemory(true).ToString();
            listBox.Items.Add( i.ToString()+") "+GC.GetTotalMemory(true).ToString());
            Window wind = new Window();
            try
            {
                

           wind.Content = XamlReader.Parse(File.ReadAllText(@"Test.XAML")) as FrameworkElement;

            }
            catch(Exception ex) {MessageBox.Show(ex.ToString()); }
           wind.Show();
           wind.Closed += wind_Closed;

           wind.Close();

        }

        void wind_Closed(object sender, EventArgs e)
        {
            Window wind = sender as Window;
            wind.Closed -= wind_Closed;
          // GC.Collect();
        }

  public Window1()
        {
            InitializeComponent();
            mem = GC.GetTotalMemory(true);
            File.WriteAllText("C:/Log.txt","Начальная память "+   mem.ToString() + "\n");
        }

        int MaxCount =  20 ;
        int i;
        long add;
        long mem;

        private void Button_Click(object sender, RoutedEventArgs e)
        { MadeWind(); }

        void MadeWind()
        {
            i++;
            add = GC.GetTotalMemory(true) - mem;
            mem = GC.GetTotalMemory(true);

            MEMORY.Text = i.ToString() + ") " + mem.ToString() + "               " + add.ToString();
            File.WriteAllText("C:/Log.txt", File.ReadAllText("C:/Log.txt") + i.ToString() + ") " + mem.ToString() + "          " + add.ToString() + "\n");

            Window wind = new Window();
            try
            {
                wind.Content = new UserControl1();  //XamlReader.Parse(File.ReadAllText(@"D:\2.08.0012.5\Development\FilterTest.XAML")) as FrameworkElement;
            }
            catch (Exception ex) { MessageBox.Show(ex.ToString()); }
            wind.Show();
            wind.Close();
            GC.Collect();
        }

    }

 DependencyPropertyDescriptor ColumnVisibilytyDescriptor = DependencyPropertyDescriptor.FromProperty(DataGridColumn.VisibilityProperty, typeof(DataGridColumn));
 ColumnVisibilytyDescriptor.AddValueChanged(Column, OnColumnVisibleChanded);

 <TextBox Text="TextBox"  Height="30" Width="200"/>