ASP.NET 操作 Text

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using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.IO;
using System.Text;
using System.Threading;
/*---------------------------------------------
* 标题：(FileStream,StreamWriter,StreamReader)对文本文件的基本操作；
* 作者：靳志远（jack15850798154）
* 时间：2010-03-22
* 地点：江苏南京
* 说明：通过 FileStream来创建文本文件来实现对数据库的排序，获取数据前几条数据等基本操作。
*----------------------------------------------
*/
public partial class _Default : System.Web.UI.Page
{

    string line;
    int counter;
    int jj;
    int i;
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            counter = 0;
            Session["counter"] = counter;

        }

    }
    /// <summary>
    ///StreamWriter 文件的写入
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void Button1_Click(object sender, EventArgs e)
    {
        if (FileName.Text.Trim().ToString() != "")
        {
            string wenjianpath = Server.MapPath(this.FileName.Text.Trim());
            bool b = File.Exists(Server.MapPath(this.FileName.Text.Trim()));
            if (b == true)
            {
                //如果文件存在就直接的在数据后面接着写。不覆盖原有的数据 (FileMode.Append实现该功能。)
                FileStream FS = new FileStream(wenjianpath, FileMode.Append, FileAccess.Write);

                StreamWriter swrite = new StreamWriter(FS, Encoding.UTF8);
                swrite.WriteLine("我是在文本文档以前有的数据中添加的。");
                swrite.Close();
                FS.Close();
            }
            else
            {
                //如果文件不存在就创建一个文本文件 (FileMode.Create实现该功能。)
                FileStream FS = new FileStream(wenjianpath, FileMode.Create, FileAccess.Write);

                StreamWriter swrite = new StreamWriter(FS, Encoding.UTF8);
                swrite.WriteLine("我是创建的文本文档。");
                swrite.Close();      //关闭读写流；
                FS.Close();          //关闭文件流；
            }

        }
    }
    /// <summary>
    ///StreamReader 文件的读取
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void Button2_Click(object sender, EventArgs e)
    {
        string wenjianpath = Server.MapPath(this.FileName.Text.Trim());
        StreamReader sr = new StreamReader(wenjianpath, Encoding.UTF8);
        // this.TextBox1.Text = sr.ReadToEnd();      //文本内容全部读取；
        this.TextBox1.Text = sr.ReadLine();       //读取文本内容的第一行内容。
    }

    /// <summary>
    /// 每隔一秒钟就刷新一次
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>

    protected void Unnamed1_Tick(object sender, EventArgs e)
    {

        ListBox1.Items.Clear();

        StreamReader sr = new StreamReader("C://aa1.txt", Encoding.UTF8);
         Session["counter"] = Convert.ToInt32(Session["counter"]) + 1;
         this.Label2.Text = Session["counter"].ToString();

        for (int i = 0; i < Convert.ToInt32(Session["counter"].ToString()); i++)
         {

                 if ((line=sr.ReadLine() )!= null)
                 {
                     this.ListBox1.Items.Add(line);

                 }
         }
         sr.Close();

    }
}