打开原先存入的文档，使文档中的信息显示在RichTextBox中

[ChrisLee的职业之路]

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
using System.Data.SqlClient;
using System.Configuration;

namespace zhyc
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
if (textBox1.Text.Length != 0 && textBox2.Text.Length != 0 && textBox3.Text.Length != 0)
{
FileStream message = File.Create("E:\\" + textBox1.Text + ".txt");
StreamWriter text = new StreamWriter(message);

text.WriteLine(textBox1.Text);
text.WriteLine(textBox2.Text);
if (textBox2.Text.Length != 12)
{
MessageBox.Show("学号应为12位数");
}

text.WriteLine(textBox3.Text);
text.Close();
message.Close();
MessageBox.Show("保存成功");
}
else
{
MessageBox.Show("出现错误，程序终结");
Close();
}
}

private void button1_KeyDown(object sender, KeyEventArgs e)
{

if (e.KeyCode == Keys.Enter)//如果输入的是回车键
{
this.button1_Click(sender, e);//触发button事件
}



}

private void button2_Click(object sender, EventArgs e)
{
FileStream message = new FileStream("E:\\" + textBox1.Text + ".txt", FileMode.Create, FileAccess.Write);
message.SetLength(0);
MessageBox.Show("删除信息成功");
}

private void button3_Click(object sender, EventArgs e)
{
Close();
}

private void button3_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Escape)//如果输入的是esc键
{
this.button3_Click(sender, e);//触发button事件
}
}

private void button4_Click(object sender, EventArgs e)
{
MessageBox.Show("请输入姓名进行查询");
Console.WriteLine(textBox1.Text);
if (textBox2.Text == "E:\\" + textBox1.Text )
{
StreamReader sr1 = new StreamReader("E:\\" + textBox1.Text + ".txt");
richTextBox1.Text = sr1.ReadToEnd();
sr1.Close();
}




我想在button 4 中实现点击查询按钮后弹出：请输入姓名进行查询，然后输入姓名，当姓名与原先存入的文档里的姓名一致时，打开此文档，使此文档的所有信息显示在richtextbox中。。请各位大神指教，谢谢啦！！！！