asp.net c#菜鸟的一些问题

protected void Page_Load(object sender, EventArgs e)
    { //创建链接
        OleDbConnection sqlcon;
        string strCon = "Provider=Microsoft.Jet.OLEDB.4.0;Data source=" + Server.MapPath("vs.mdb");
        sqlcon = new OleDbConnection(strCon);
       //创建识别器
        string sqlstr = "select * from newl";
       OleDbDataAdapter myda = new OleDbDataAdapter(sqlstr, sqlcon);
       // OleDbDataAdapter
        DataSet myds = new DataSet();
        sqlcon.Open();//不用也可以,因为dataadapter默认就打开了.
        myda.Fill(myds);
      //绑定数据
        Repeater1.DataSource = myds;
        Repeater1.DataBind();
     //关闭
        sqlcon.Close();
    }