设计一个windows应用程序，实现不同运算。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        string s;
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if(textBox1.Text.Length==0||textBox2.Text.Length==0)
            {

                MessageBox.Show("请输入数据！");
                return;
           
            }
            try
            {
                double x = double.Parse(textBox1.Text);
                double y = double.Parse(textBox2.Text);
                //textBox3.Text=(x y).ToString();
                switch (s)
                {
                    case "+": textBox3.Text = (x + y).ToString(); break;
                    case "-": textBox3.Text = (x - y).ToString(); break;
                    case "*": textBox3.Text = (x * y).ToString(); break;
                    case "/": textBox3.Text = (x / y).ToString(); break;
                    default: textBox3.Text = "错误"; break;

                }
            }
            catch(Exception ex)
            {MessageBox.Show(ex.Message);}
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {

            s = comboBox1.Text;
            //MessageBox.Show(s);
        }
    }
}

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