vb.net control attributes -

i have user defined control call in aspx page. want change attributes on vb.net code side. top of aspx page control -

<%@ register src="lightbox.ascx" tagname="abc" tagprefix="uc1" %> calling control in body - <uc1:abc id="abc" runat="server" /> 

vb.net page_load -

if session("ased") = true                 abc.attributes.add("visible", "true")             else                 abc.attributes.add("visible", "false")             end if 

on debug mode see code change values according session on control not pick "false" or "true" attribute. shows control anyways.

for server side controls, should able use visible property

    if session("ased") = true             abc.visible = true         else             abc.visible = false         end if 

if have use attribute, should using "display"

    if session("ased") = true             abc.attributes.add("display", "block")         else             abc.attributes.add("display", "none")         end if