using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int a, b;
            a = 10;
            b = 11;
            //Console.WriteLine("{0}",a>b?a:b);
            Console.WriteLine("{0}",a.CompareTo(b));
            //当a>b时，a.CompareTo(b)==1
            //当a=b时，a.CompareTo(b)==0
            //当a<b时，a.CompareTo(b)==-1
            Console.ReadKey();
        }
    }
}

------解决方案--------------------
？：就解决了啊。。。不用刻意写个函数吧。。。

------解决方案--------------------
Math.Min
Math.Max

------解决方案--------------------
C# code

public static int Max(int val1, int val2)
{
    if (val1 < val2)
    {
        return val2;
    }
    return val1;
}