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

		internal static string Unescape (string str, bool excludeSpecial) 
		{
			if (str == null)
				return String.Empty;
			StringBuilder s = new StringBuilder ();
			int len = str.Length;
			for (int i = 0; i < len; i++) {
				char c = str [i];
				if (c == '%') {
					char surrogate;
					char x = HexUnescapeMultiByte (str, ref i, out surrogate);
					if (excludeSpecial && x == '#')
						s.Append ("%23");
					else if (excludeSpecial && x == '%')
						s.Append ("%25");
					else if (excludeSpecial && x == '?')
						s.Append ("%3F");
					else {
						s.Append (x);
						if (surrogate != char.MinValue)
							s.Append (surrogate);
					}
					i--;
				} else
					s.Append (c);
			}
			return s.ToString ();
		}