//读取EXCEL        public static DataSet LoadDataFromExcel(string filePath) //加载excel 返回DataSet内存数据库        {            try            {                string strConn;                strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filePath + ";Extended Properties='Excel 8.0;HDR=False;IMEX=1'";                OleDbConnection OleConn = new OleDbConnection(strConn);                OleConn.Open();                String sql = "SELECT * FROM  [Sheet1$]";//可是更改Sheet名称，比如sheet2，等等                   OleDbDataAdapter OleDaExcel = new OleDbDataAdapter(sql, OleConn);                DataSet OleDsExcle = new DataSet();                OleDaExcel.Fill(OleDsExcle, "Sheet1");                OleConn.Close();                return OleDsExcle;            }            catch (Exception err)            {                MessageBox.Show("数据绑定Excel失败!失败原因：" + err.Message, "提示信息",                    MessageBoxButtons.OK, MessageBoxIcon.Information);                return null;            }        }

//读取private void button1_Click(object sender, EventArgs e)        {            string excelPath = "测试.xlsx"; //文件路径            string fileExt = Path.GetExtension(excelPath);//获得文件扩展名            string conn = "";            if (fileExt == ".xls")            {                conn = "Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source =" + excelPath + ";Extended Properties='Excel 8.0;HDR=Yes;IMEX=1'";            }            else            {                conn = "Provider = Microsoft.ACE.OLEDB.12.0 ; Data Source =" + excelPath + ";Extended Properties='Excel 12.0;HDR=Yes;IMEX=1'";            }            OleDbConnection con = new OleDbConnection(conn);            DataTable dt = new DataTable();            OleDbDataAdapter da = new OleDbDataAdapter("select * from [Admin$]", con); //查询表名文件Admin的数据表            con.Open();            da.Fill(dt); //填充到dt            con.Close();            foreach (DataRow dr in dt.Rows)            {                MessageBox.Show(dr["管理员编号"].ToString());            }        }