using System;

using System.Collections.Generic;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        var data = new List<string>() {"(1.) Édes élet","(10.) Random termék","(2.) Nem tudom","(23.) Passz","(14.) Izé" ,"(3.) Sok lesz","(21.) Culinaris"};

        data.Sort(new NumStrCmp());

        foreach(var x in data){

            Console.WriteLine(x);

        }

    }

}

public class NumStrCmp : IComparer<string> {

    public int Compare(string x, string y){

        Regex regex = new Regex(@"(?<NumPart>\d+)(?<StrPart>\D*)",RegexOptions.Compiled);

        var mx = regex.Match(x);

        var my = regex.Match(y);

        var ret = int.Parse(mx.Groups["NumPart"].Value).CompareTo(int.Parse(my.Groups["NumPart"].Value));

        if(ret != 0) return ret;

        return mx.Groups["StrPart"].Value.CompareTo(my.Groups["StrPart"].Value);

    }

}

​