c# 读取txt文件内容

using System.IO;

using System.Data.OleDb;

 

        private string sql = "";
        private string strConnection = @"Provider=Microsoft.Jet.OleDb.4.0;Data Source=./hf.mdb";
        OleDbConnection conn = new OleDbConnection();       
        OleDbCommand cmd = new OleDbCommand();
       

 

StreamReader sr = new StreamReader(@"C:/Documents and Settings/M.90F002E5C7904EA/桌面/D512计费系统/20080808.txt");

 while (!sr.EndOfStream)
            {

                
                string strd = sr.ReadLine().ToString().Trim();
                string str = strd.Substring(0,3);
                str += strd.Substring(20,6);
                //txt +=str;

 

--以下为写数据库
                sql = "insert into hf(fjh,total) values('" + str.Substring(0, 3) + "','" + str.Substring(4) + "')";
                cmd.Connection = conn;
                conn.Open();
                cmd.CommandText = sql.ToString();
                cmd.ExecuteNonQuery();
                conn.Close();
            }
            sr.Close();
            this.textBox1.Text = txt.ToString();

 

 

 

 

---另外加点

private void button1_Click(object sender, EventArgs e)
        {
            System.IO.StreamWriter sr = File.CreateText(".//ly.txt");
            sr.Write(this.textBox1.Text);
            sr.Close();

        }

        private void button2_Click(object sender, EventArgs e)
        {
            StreamReader sr = new StreamReader(".//ly.txt");
            string strd="";
            while (!sr.EndOfStream)
            {
                 strd = sr.ReadLine().ToString().Trim();
            }
            MessageBox.Show(strd.ToString());
            sr.Close();

        }