DataList的问题！

我想请问下各位大侠：  
当点击一个 “添加”按钮 时，我想要添加一行DataList  
请问怎么实现啊？

我是这么写的  但是没有效果  是怎么回事啊？

         //dlProtect_pwd是DataList控件的ID  
        TextBox txtBox_Ques = (TextBox)dlProtect_pwd.Items[0].FindControl("TxtQuestion");         
        TextBox txtBox_Answ = (TextBox)dlProtect_pwd.Items[0].FindControl("TxtAnswer");
        Label lb_Ques = (Label)dlProtect_pwd.Items[0].FindControl("LblQuestion");
        Label lb_Answ = (Label)dlProtect_pwd.Items[0].FindControl("LblAnswer");
       // int number = dlProtect_pwd.Items.Count;
        
        DataListItem dli = new DataListItem(0, ListItemType.Item);
        dli.Controls.Add(lb_Ques);
        dli.Controls.Add(txtBox_Ques);
        dli.Controls.Add(lb_Answ);
        dli.Controls.Add(txtBox_Answ);
        this.dlProtect_pwd.Controls.Add(dli);




[ 本帖最后由 hhy420459674 于 2010-5-20 13:52 编辑 ]