请高手指点,如何动态控制DataList控件里EditItemTemplate中的一个TextBox控件的属性.

请高手指点,如何动态控制DataList控件里EditItemTemplate中的一个TextBox控件的属性.<EditItemTemplate><asp:Label id="labelid" Text= '<%# DataBinder.Eval(Container.DataItem,"id") %>' runat="server" Visible="false"/><asp:Label id="labelnx" Text= '<%# DataBinder.Eval(Container.DataItem,"nx") %>' runat="server" Visible="false"/><table width="240" border="0" cellspacing="0" cellpadding="0"><tr><td height="22"><FONT COLOR="black">货号:[<asp:Label id="type" Text= '<%# DataBinder.Eval(Container.DataItem,"type") %>' runat="server"/>]<asp:Label id="code" Text= '<%# DataBinder.Eval(Container.DataItem,"code") %>' runat="server"/></FONT></td></tr><tr><td height="22"><FONT COLOR="black">单价:￥<asp:Label id="price" Text= '<%# DataBinder.Eval(Container.DataItem,"price") %>' runat="server"/>元</FONT></td></tr><tr><td height="22">&nbsp;&nbsp;&nbsp;&nbsp;<asp:TextBox ID="howmany" Runat="server" BorderStyle="Groove" TextMode="SingleLine" Width="40"Height="20px">1</asp:TextBox><asp:button id="updateincart" runat="server" CssClass="hand" Height="20px" Text="确定" BorderStyle="Outset" CommandName="update" /><asp:button id="canceledit" runat="server" CssClass="hand" Height="20px" Text="取消" BorderStyle="Outset" CommandName="Cancel" /><br><asp:TextBox ID="ring" Runat="server" BorderStyle="Groove" TextMode="SingleLine" Width="200" Height="20px" Visible="False" /></td></tr></table></EditItemTemplate>private void dlsp_EditCommand(object source,System.Web.UI.WebControls.DataListCommandEventArgs e){if (Session["user"]==null){firstbind();}else{string typedit = ((Label)e.Item.FindControl"typedit")).Text;dlsp.EditItemIndex = e.Item.ItemIndex;typedit=typedit.Substring(2,2);/////////////////////请问如何在这里控制上面id=ring的TextBox控件visible属性//////////////if(typedit=="er"){.Visible = true;}else{.Visible = false;}bind();}}为什么没人理我呀TextBox txtring = (TextBox)e.Item.FindControl("ring");txtring.visible=true;呵呵，C#语法不太懂，如果哪里标点语法错误，你改一下，就是这样就可以了这样不行的呀,这样是修改ItemTemeplate里控件的属性,并不是修改EditItemTemplate里控件的属性呀对bind();提到if(typedit=="er"){.Visible = true;}else{.Visible = false;}以前如果你的typedit是ItemTemeplate里面的话代码修改如下string typedit = ((Label)e.Item.FindControl"typedit")).Text;typedit=typedit.Substring(2,2);dlsp.EditItemIndex = e.Item.ItemIndex;bind();if(typedit=="er"){((TextBox)e.Item.FindControl("ring")).Visible = true;}else{((TextBox)e.Item.FindControl("ring")).Visible = false;}Private Sub DataGrid1_ItemCreated(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DataGridItemEventArgs) Handles DataGrid1.ItemCreated Select Case e.Item.ItemType Case ListItemType.Item, ListItemType.AlternatingItem TextBox txtring = (TextBox)e.Item.FindControl("ring"); txtring.visible=true; End Select End Sub还是不行吗,显示:异常详细信息: System.NullReferenceException: 未将对象引用设置到对象的实例。试了半天，还是不行。帮楼主顶一下！先去吃饭了。。。