static extern int FillRect(IntPtr hDC, [In] ref RECT lprc, IntPtr hbr);

Private Shared Function FillRect(hDC As IntPtr, ByRef lprc As RECT, hbr As IntPtr) As Integer

    /// For example, when RECT is passed to the FillRect function, the rectangle is filled up to, but not including,

    /// For example, when RECT is passed to the FillRect function, the rectangle is filled up to, but not including,

drawingArea.FillRectangle(lGB, drawingArea.VisibleClipBounds)

        e.Graphics.FillRectangle(backcolorBrush, e.Bounds);