Form1.cs

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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
    {

        public Form1() { InitializeComponent(); }

             #region
        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            Button Btn = (Button)sender; textBox1.Text += button1.Text;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Button Btn = (Button)sender; textBox1.Text += button2.Text;
        }

        private void button3_Click(object sender, EventArgs e)
        {
            Button Btn = (Button)sender; textBox1.Text += button3.Text;
        }
        // 下载于www.51aspx.com
        private void button4_Click(object sender, EventArgs e)
        {
            Button Btn = (Button)sender; textBox1.Text += button4.Text;
        }

        private void button5_Click(object sender, EventArgs e)
        {
            Button Btn = (Button)sender; textBox1.Text += button5.Text;
        }

        private void button6_Click(object sender, EventArgs e)
        {
            Button Btn = (Button)sender; textBox1.Text += button6.Text;
        }

        private void button7_Click(object sender, EventArgs e)
        {
            Button Btn = (Button)sender; textBox1.Text += button7.Text;
        }