ASCIIArt.ASCIIArt.GetCharSize C# (CSharp) Method

        private static Size GetCharSize(Font font)
        {
            const string measure_string = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

            IntPtr hdc = NativeMethods.CreateCompatibleDC(IntPtr.Zero);
            NativeMethods.SelectObject(hdc, font.ToHfont());
            NativeMethods.TEXTMETRIC tm;
            NativeMethods.GetTextMetrics(hdc, out tm);
            NativeMethods.SIZE size;
            NativeMethods.GetTextExtentPoint32(hdc, measure_string, measure_string.Length, out size);
            NativeMethods.DeleteDC(hdc);
            return new Size((int)Math.Round((double)size.cx / (double)measure_string.Length), tm.tmHeight);
        }
    }