读取文件的例子 IO

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http://www.cckan.net/forum.php?mod=viewthread&tid=38&extra=page%3D1

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

namespace 读取文件和写入文件
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            StreamWriter sfile = new StreamWriter("j://sufei.txt");//写入到sufei.txt文件中
            sfile.Write("sufeisufei");
            sfile.Close();
            StreamReader ss = new StreamReader("j://sufei.txt");//读取文件sufei.txt中的内容
            this.richTextBox1.Text = ss.ReadLine();
            ss.Close();
           
        }
    }
}