System.Xml.XmlBufferReader.GetApostropheCharEntity C# (CSharp) Method

        private int GetApostropheCharEntity(int offset, int length)
        {
            byte[] buffer = _buffer;
            if (length != 6 ||
                buffer[offset + 1] != (byte)'a' ||
                buffer[offset + 2] != (byte)'p' ||
                buffer[offset + 3] != (byte)'o' ||
                buffer[offset + 4] != (byte)'s')
            {
                XmlExceptionHelper.ThrowInvalidCharRef(_reader);
            }
            return (int)'\'';
        }