排序是很常用到的方法
下面示範 由小排到大
如果是要從大排到小是使用
orderby str descending

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace SortMethod
{
    class Program
    {
        static void Main(string[] args)
        {
            List<string> strList =
                new List<string> { "1","apple","ball","ba", "2", "4","5","8", "7" };
            IEnumerable<string> enumList =
                from str in strList
                orderby str
                select str;
            string orderbyString = "原始字串：";
            foreach (string str in strList)
            {
                orderbyString += str + ",";
            }
            Console.WriteLine(orderbyString);
            orderbyString = "排序後的字串：";
            foreach (string str in enumList)
            {
                orderbyString += str + ",";
            }
            Console.WriteLine(orderbyString);
            Console.ReadLine();               
        }
    }
}