C# IO操作磁盘上的txt

using System.IO;

//写入并导出到磁盘
            StreamWriter sw = new StreamWriter(@"H:\text.txt");
            sw.WriteLine("ABC");
            sw.WriteLine("测试");
            sw.WriteLine(123);
            sw.Close();

            //读取txt
            StreamReader sr = new StreamReader(@"H:\text.txt");
            Response.Write(sr.ReadLine() + "</br>");
            Response.Write(sr.ReadLine() + "</br>");
            Response.Write(sr.ReadLine() + "</br>");