显示长日期格式时间

 protected void Page_Load(object sender, EventArgs e)
    {
        sqlcon = new SqlConnection(strCon);
        string sqlstr = "select top 1 * from tb_Member";
        SqlDataAdapter myda = new SqlDataAdapter(sqlstr, sqlcon);
        DataSet myds = new DataSet();
        sqlcon.Open();
        myda.Fill(myds,"tb_Member");
        DataList1.DataSource = myds;
        DataList1.DataBind();
        DataRowView mydrv = myds.Tables["tb_Member"].DefaultView[0];
        for(int i=0;i<=DataList1.Items.Count-1;i++)
        {
            Label lab=(Label)DataList1.Items[i].FindControl("Lable1");
            DateTime dt=Convert.ToDateTime(mydrv["date"]);
            lab.Text=dt.ToLongDateString();
         }
        sqlcon.Close()
    }