C#小学生算术测验

你不说改成什麽样，让别人怎麼入手…

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
protected void Button1_Click(object sender, EventArgs e)
{
int n, m, op;
Label3.Text = "";
Random x = new Random();
n = Convert.ToInt16(100 * x.NextDouble());
m = Convert.ToInt16(100 * x.NextDouble());
TextBox1.Text = n.ToString();
TextBox2.Text = m.ToString();
op = Convert.ToInt16(1 + 3 * x.NextDouble());
switch (op)
{
case 1:
Label1.Text