using System;

using System.Linq; 

using System.Collections.Generic;

using System.Text.RegularExpressions; 

public class Program

{

    public static void Main()

    {

         string[] things= new string[] {  "paul", "bob", "lauren", "007", "90", "101"};

​

    foreach (var thing in things.OrderByDescending(x => x, new SemiNumericComparer()))

    {    

        Console.WriteLine(thing);

    }

}

}

​

​

​

​

public class SemiNumericComparer: IComparer<string>

{

    public int Compare(string s1, string s2)

    {

        if (IsNumeric(s1) && IsNumeric(s2))

        {

             if (Convert.ToInt32(s1) > Convert.ToInt32(s2)) return 0;

            if (Convert.ToInt32(s1) < Convert.ToInt32(s2)) return 1;

            if (Convert.ToInt32(s1) == Convert.ToInt32(s2)) return -1;

        }

​

        if (IsNumeric(s1) && !IsNumeric(s2)){

            return -1;

        }

​

        if (!IsNumeric(s1) && IsNumeric(s2)){

            return 1;

        };

        return string.Compare(s1, s2, true);

    }

​

    public static bool IsNumeric(object value)

    {

        try {

            int i = Convert.ToInt32(value.ToString());

            return true; 

        }

        catch (FormatException) {

            return false;

        }

    }

}