How to use DrawToBitmap in WPF to take print from screen?

Following is the functional code of WinForms :

Bitmap pic = new Bitmap(label1.Width, label1.Height);
Rectangle rect = new Rectangle(0, 0, label1.Width, label1.Height);
rect = label1.ClientRectangle;
label1.DrawToBitmap(pic, rect);
// pic.Save("C:\, ImageFormat.Jpeg);

The code above takes printscreen from label1 and saves the image in place.

How can I do the same from WinForms to WPF ?

The attempt code of WPF follows:

Rect bounds = VisualTreeHelper.GetDescendantBounds(label1);

RenderTargetBitmap renderTarget = new RenderTargetBitmap((Int32)bounds.Width, (Int32)bounds.Height, 96, 96, PixelFormats.Pbgra32);

DrawingVisual visual = new DrawingVisual();

using (DrawingContext context = visual.RenderOpen())
{
    VisualBrush visualBrush = new VisualBrush(label1);
    context.DrawRectangle(visualBrush, null, new Rect(new System.Windows.Point(), bounds.Size));
}

renderTarget.Render(visual);
PngBitmapEncoder bitmapEncoder = new PngBitmapEncoder();
bitmapEncoder.Frames.Add(BitmapFrame.Create(renderTarget));

using (Stream stm = File.Create(@"C:\Users\Matheus Miranda\Desktop\TESTE"))
{
    bitmapEncoder.Save(stm);
}

Any solution?