下面的代码该怎样改正。搞了半天都不懂。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace 函数对比大小值
{
    class Program
    {
        static void Main(string[] args)
        {
            int a = Convert.ToInt32(Console.ReadLine());
            int b = Convert.ToInt32(Console.ReadLine());
            int k =minnum(a, b); //就这里有问题
            Console.WriteLine(k);
        }

        int minnum(int a, int b)
        {
            int c = 0;
            if (a > b)
            {
                c =b;
            }
            else if (a < b)
            {
                c =a;
            }
            return c;
        }
    }
}

谢谢。