C#读Excel数据

/// <summary>
        /// 从excel中得到数据返回dataset
        /// </summary>
        /// <param name="filePath_Name"></param>
        /// <param name="pageName"></param>
        /// <returns></returns>
        public static DataSet getDataFromExcel(string filePath_Name, string pageName)
        {
            DataSet OleDsExcle = null;
            string strConn = string.Empty;
            OleDbConnection OleConn = null;
            var fileType = Path.GetExtension(filePath_Name.ToLower()).Trim();
            if (fileType == ".xlsx")
            {
                strConn = string.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=Excel 12.0;", filePath_Name);
            }
            else if(fileType == ".xls")
            {
                strConn = string.Format(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source = {0};Extended Properties='Excel 8.0;HDR=False;IMEX=1'", filePath_Name); 
            }
            try
            {
                OleConn = new OleDbConnection(strConn);
                OleConn.Open();                          
                string sql = string.Format("SELECT * FROM  [{0}$]", pageName);  //可是更改Sheet名称，比如sheet2，等等   
                OleDbDataAdapter OleDaExcel = new OleDbDataAdapter(sql, OleConn);
                OleDsExcle = new DataSet();

                OleDaExcel.Fill(OleDsExcle, pageName);
                OleConn.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show("读取Excel文件失败！请确认Excel文件是否\n能打开或已经处于打开状态！", "提示");
                string errorMsg = ex.Message;
            }
            return OleDsExcle;
        }