wince下写入数据到csv/txt文件中

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using SmartDeviceProject1.WebReference;
using System.Reflection;

namespace SmartDeviceProject1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        StreamWriter sw = null;
        private void button1_Click(object sender, EventArgs e)
        {
            string path = @"\My Documents\入库.csv";//保存文件的路径
            try
            {
                if (File.Exists(path))//如果文件已创建
                {
                    this.sw = File.AppendText(path);
                    this.sw.WriteLine("叠加数据,123," + DateTime.Now.ToShortDateString());
                }
                else
                {
                    this.sw = new StreamWriter(path);//如果没有创建this.sw.WriteLine("新建数据,789," + DateTime.Now.ToShortDateString());
                }
            }
            catch (Exception ex)//异常处理
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                //清空缓冲区
                this.sw.Flush();
                //关闭流
                this.sw.Close();
            }
        }

    }
}

vs2008测试正常。