asp.net - I need change class for CSS of asp:Panel with VB.NET -

i have problems changing class of css in asp:panel. try lot of tips here me. code of itemtemplate is:

<itemtemplate>      <asp:panel class="item" runat="server">          <asp:label id="customernamelabel" runat="server" text='<%# eval("customername") %>' />          <br />          <asp:label id="lastincomelabel" runat="server" text='<%# eval("lastincome") %>' />          <br />       </asp:panel>  </itemtemplate>

and try this:

protected sub myevent(byval sender object, byval e eventargs)          dim dt new date          dim dv system.data.dataview          dim thepanel htmlgenericcontrol = new htmlgenericcontrol("item")            dv = ctype(sqldatasource1.select(datasourceselectarguments.empty), dataview)          dim s string          s = dv.table.rows.item(0).item(1)          lastincome = convert.todatetime(s)            if lastincome.addhours(1) <              thepanel.attributes.add("style", "background-color:red") 'problem          else              thepanel.attributes("class") = "itemgreen" 'ok          end if  end sub

i have tried thepanel.attributes.add or thepanel.attributes("class") = "itemgreen" not function on onload="myevent" in listview declaration.

can me? thanks

you set function eval.

<asp:panel cssclass='<%# getcssclass(eval("lastincome")) %>' runat="server"> 

that way don't need handle event or try figure out element/item use.

the function , logic needed return right css.

function getcssclass(byval lastincome datetime) string 

i suggest have class called itemred instead of setting color red directly in style attribute.

if want use event, suggest use other 1 load. check itemcreated.