How to replace a character in a string without using the replace()method?

Thanks,
Rajni Shekhar

String ab = "hellohello";

            String bc = "ll";

            String cd = "ss";



            var _matches = System.Text.RegularExpressions.Regex.Matches(ab, bc);

            foreach (System.Text.RegularExpressions.Match item in _matches)

            {

                ab=ab.Remove(item.Index, item.Length);

                ab=ab.Insert(item.Index, cd);

            }



            Console.Write(ab);

Thanks,
Sanjay

Thanks,
Rajni Shekhar

   String ab = "hellohello";

        String bc = "ll";

        String cd = "ss";

        string result =

           Regex.Replace(ab, bc, cd, RegexOptions.IgnoreCase);

        Response.Write(result);

Thanks,
Sanjay