class Import    {        /// <summary>        /// 导入Excel到DataSet中        /// </summary>        /// <param name="strFileSourse">文件的路径和文件全名，含扩展名</param>        /// <returns></returns>        public DataSet ExcelToDataSet(string strFileSourse)        {            DataSet ds = new DataSet();            //Excel数据源（兼容03/10）            string strConn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + strFileSourse + ";Extended Properties=\"Excel 12.0;HDR=YES;IMEX=1\"";            //连接            OleDbConnection conn = new OleDbConnection(strConn);            try            {                conn.Open();                //获取Excel中所有的sheet                DataTable dtSheet = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });                //把Excel中所有的sheet数据读到一个Table中                for (int i = 0; i < dtSheet.Rows.Count; i++)                {                    string strSheetName = dtSheet.Rows[i]["TABLE_NAME"].ToString();                    OleDbDataAdapter OleDa = new OleDbDataAdapter("select * from [" + strSheetName + "]", conn);                    OleDa.Fill(ds, "TableName");                    conn.Close();                }            }            catch (Exception ex)            {                MessageBox.Show(ex.Message);            }            finally            {                if (conn.State != ConnectionState.Closed)                {                    conn.Close();                }            }            return ds;        }    }