Read from file

using System.IO;

            FileStream fs = new FileStream(Application.StartupPath + "\\AlarmSet.txt", FileMode.Open, FileAccess.ReadWrite);
            StreamReader sr = new StreamReader(fs, Encoding.GetEncoding("utf-8"));  // 加上Encoding.GetEncoding("utf-8")解决乱码
            string line = "";
            string totaltxt = "";
            while (line != null)
            {
                line = sr.ReadLine();
                totaltxt = totaltxt + line;                  
            }
            textBox1.Text = totaltxt;
            sr.Close();
            fs.Close();