我想从Database类里面获取数据集,下面这样写对不对?public partial class Pages_Materiel_MateQuery : System.Web.UI.Page
{    protected void Page_Load(object sender, EventArgs e)
    {        DataSet ds = new DataSet();
        string sqlstr = "select datetime,mate_code,mate_name,company2,unitprice3,num,total,buyer,tel2,handler,arrearage,jh_repayment,sj_repayment,re3 from  Materiel_storage ";
        Database db = new Database();
        db.ExecTran(sqlstr);
        this.gw1.DataSource = ds;
        this.gw1.DataBind();    }
}