C# 读取excel

//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());
            }
        }