WinCE的C#中使用StreamReader 回读取TXT文档，读取文本文档

using System.IO;

        private void button1_Click(object sender, EventArgs e)        {            string strFilePath = "";            OpenFileDialog fd = new OpenFileDialog();            fd.Filter = "文本文件(*.txt)|*.txt|All files (*.*)|*.*"; //过滤文件类型            //fd.InitialDirectory = Application.StartupPath + "\\Temp\\";//设定初始目录            //fd.ShowReadOnly = true; //设定文件是否只读            if (fd.ShowDialog() != DialogResult.OK)            {                return;            }            strFilePath = fd.FileName;            if (!File.Exists(strFilePath))            {                MessageBox.Show("抱歉！文件不存在，请重新输入文件名！");                return;            }            StreamReader strReader = new StreamReader(new FileStream(strFilePath, FileMode.Open, FileAccess.ReadWrite), Encoding.Default);            //string strTemp = strReader.ReadLine();            string strTemp = strReader.ReadToEnd();            strReader.Close();            textBox1.Text = strTemp;        }