private void Readwork()
    {
        int Wcid   = Int32.Parse(Request.QueryString["Cid"].ToString());
        int Wclass = Int32.Parse(DDLclass.SelectedValue);

        LearnSite.BLL.Works ws = new LearnSite.BLL.Works();
        DDLstore.DataSource     = ws.GetListNoWcheckWork(Wcid, Wclass);
        DDLstore.DataTextField  = "Sname";
        DDLstore.DataValueField = "Wurl";
        DDLstore.DataBind();
        int curindex = Int32.Parse(lbcurindex.Text);

        if (DDLstore.Items.Count > 0)
        {
            int allindex = DDLstore.Items.Count - 1;
            if (curindex == allindex)
            {
                lbcurindex.Text = "0";
            }
            if (curindex < allindex)
            {
                DDLstore.SelectedIndex = curindex;
            }
        }
    }