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The SystemInformation.BorderSize property indicates the thickness of a flat-style system control border in pixels.
The System.Drawing.Size.Width property of the SystemInformation.BorderSize property indicates the width of a vertical flat-style border. The System.Drawing.Size.Height property of the SystemInformation.BorderSize property indicates the height of a horizontal flat-style border.
The SystemInformation.Border3DSize property of the System.Windows.Forms.SystemInformation class indicates the thickness of a three-dimensional (3-D) style window or system control border.