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string source = "122234";
Regex reg = new Regex(@"(\d)(?=[^\1]*\1)");
source = reg.Replace(source, ""); //source = 1234
string a = "12324";
string d = string.Join("", a.ToCharArray().Distinct().OrderBy(x => x).Select(x => x.ToString()).ToArray()).Trim();
string tempStr = "12234";
string temp_list=string.Join("",tempStr.ToCharArray().Distinct());//1234
string source = "12234";
Regex reg = new Regex(@"([\d])(?=\1)");
source = reg.Replace(source, ""); //source = 1234