大小写字母装换器

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大小写字母装换器

实现代码：

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 实验2._1{    public partial class Form1 : Form    {        string s;        public Form1()        {            InitializeComponent();        }           private void button1_Click(object sender, EventArgs e)        {            s = textBox1.Text;            string b = s.ToUpper();            textBox1.Text = b;        }        private void button2_Click(object sender, EventArgs e)        {            s = textBox1.Text;            string b = s.ToLower();            textBox1.Text = b;        }        private void button3_Click(object sender, EventArgs e)        {            Application.Exit();        }            }}

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