c# winform 程序 读取Excel
是一个桌面程序，怎么实现读取Excel呢然后将内容生成一个txt文档呢？
好像要引用什么的，，，
新手，所以请大家耐心教下我。多谢！！

[解决办法]

C# code

/// <summary>        /// 上传Excel文件到服务器端        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        protected void btnUpdateComment_Click(object sender, EventArgs e) {            //第一步,上传EXCEL到服务器端            if (FileUpload1.HasFile) {                //验证EXCEL文件格式                if (FileUpload1.FileName.ToLower().IndexOf(".xls") == -1) {                    RequiredFieldValidator1.ErrorMessage = "不是有效的Excel文件";                    RequiredFieldValidator1.IsValid = false;                    return;                }                //EXCEL评论保存位置                string _FilePath = string.Empty;                if (System.Configuration.ConfigurationManager.AppSettings["CommentExcelFile"] != null) {                    _FilePath = System.Configuration.ConfigurationManager.AppSettings["CommentExcelFile"].ToString();                }                //如果此目录不存在则创建此目录                if (!System.IO.Directory.Exists(_FilePath)) {                    System.IO.Directory.CreateDirectory(_FilePath);                }                //生成文件名称                string _FileName = DateTime.Now.ToString("yyyyMMddHHmmss") + "-" + DateTime.Now.Ticks.ToString().Substring(0, 4) + ".xls";                _FileName = _FilePath + @"\" + _FileName;                //保存此文件到服务器指定位置                try {                    FileUpload1.SaveAs(_FileName);                    Response.Redirect(string.Format("CommentDetail.aspx?FileName={0}", _FileName));                } catch (Exception exp) {                    throw exp;                }            }        }#region 读取EXCEL        /// <summary>        /// 读取Excel文档        /// </summary>        /// <param name="Path">文件名称</param>        /// <returns>返回一个数据集</returns>        /// http://dev.csdn.net/article/72/72658.shtm        public static DataSet ExcelToDS(string Path) {            if (!string.IsNullOrEmpty(Path)) {                string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + Path + ";" + "Extended Properties=Excel 8.0;";                OleDbConnection conn = new OleDbConnection(strConn);                conn.Open();                string strExcel = "";                OleDbDataAdapter myCommand = null;                DataSet ds = null;                strExcel = "select * from [sheet1$]";                myCommand = new OleDbDataAdapter(strExcel, strConn);                ds = new DataSet();                myCommand.Fill(ds);                return ds;            }            return null;        }        #endregiontry {                    DataSet ds = CommUtil.ExcelToDS(_FileName);                    if (ds != null                        && ds.Tables.Count > 0                        && ds.Tables[0].Rows.Count > 0) {//略...