高手帮忙写个C#小程序

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

namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
int[] a = new int[5];
for (int i = 0; i < 5; i++)
{
Console.WriteLine("请输入第"+(i+1)+"个数：");
a[i] = Convert.ToInt32(Console.ReadLine());
}
Console.Write("从小到大排列是：");
ArrayList lst = new ArrayList(a);
lst.Sort();
foreach (int s in lst)
Console.Write(s.ToString() + " ");
Console.ReadLine();
}
}
}

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

namespace ConsoleApplication13
{
class Program
{