System.Uri.Uri.HexUnescape C# (CSharp) Method

		public static char HexUnescape (string pattern, ref int index) 
		{
			if (pattern == null) 
				throw new ArgumentException ("pattern");
				
			if (index < 0 || index >= pattern.Length)
				throw new ArgumentOutOfRangeException ("index");

			if (!IsHexEncoding (pattern, index))
				return pattern [index++];

			index++;
			int msb = FromHex (pattern [index++]);
			int lsb = FromHex (pattern [index++]);
			return (char) ((msb << 4) | lsb);
		}