Gets the thickness, in pixels, of the resizing border that is drawn around the perimeter of a window that is being drag resized.
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The SystemInformation.FrameBorderSize property indicates the width and height of the resizing border for a window.
The System.Drawing.Size.Width value of this property is the width of a vertical resizing border. The System.Drawing.Size.Height value of this property is the height of a horizontal resizing border.