System.Text.GB18030Encoding.IsGBTwoByteTrailing C# (CSharp) Method

        internal bool IsGBTwoByteTrailing(short ch)
        {
            // Return true if we are in range for the trailing byte of a 2 byte sequence
            return (((ch) >= 0x40 && (ch) <= 0x7e) ||
                    ((ch) >= 0x80 && (ch) <= 0xfe));
        }