How to copy Clip of an Image to Clipboard C# Code in a WPF Application

This is the Code the Works in Window Forms Application (Non-WPF)
"TiffImage" is a picturebox Control
public Bitmap ImageClip;

pivate void CopyBlock()
{
    Point topLeft = new Point(Math.Min(pointStart.X, pointEnd.X), Math.Min(pointStart.Y, pointEnd.Y));
    int clipWidth = Math.Abs(pointEnd.X - pointStart.X + 1),
        clipHeight = Math.Abs(pointEnd.Y - pointStart.Y + 1);

    ImageClip = new Bitmap(clipWidth, clipHeight);
    Graphics Gra = Graphics.FromImage(ImageClip);
    Gra.DrawImage(TiffImage.Image, new Rectangle(0, 0, clipWidth, clipHeight),
                                           topLeft.X, topLeft.Y, clipWidth, clipHeight, GraphicsUnit.Pixel);
    Gra.Dispose();

    Clipboard.SetDataObject(ImageClip);
}

What is the Code to do this in WFP Application