public static extern int FillRect(nint hDC, ref Win32.RECT rc, nint hbr)

Public Shared Function FillRect(hDC As IntPtr, ByRef rc As Win32.RECT, hbr As IntPtr) As Integer

public static void FillRect(nint hdc, Rectangle bounds, nint hBrush)

Public Shared Sub FillRect(hdc As IntPtr, bounds As Rectangle, hBrush As IntPtr)