css - maintain Menu Item selected state -

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i have menu in asp.net page.the menuitem , url loading dynamically code behind during ispostback=false.

after clicked on of menu item, selected item background color changed , after directing url, selected state cleared.

i tried code below , not work.the css class not applied item after postback

  dim s2 string = request.querystring("sub")     each item menuitem in menu1.items         if item.text = s2             item.selected = true                           exit         end if     next   <asp:menu id="menu1" runat="server" role="tablist" orientation="horizontal"  cssclass="nav nav-pills"  forecolor="black" renderingmode="list" includestyleblock="false">                      <%-- <statichoverstyle cssclass="focus" />--%>                      <staticmenustyle cssclass="nav nav-pills"/>                         <staticmenuitemstyle cssclass="mainnavstyle"/>                         <staticselectedstyle cssclass="active"/>                  </asp:menu>

html mark after selected. active class there. disappeared after postback or page load 

<div role="tablist" class="nav nav-pills" id="ctl00_menu1" style="float: left;"> <ul class="level1 nav nav-pills static" tabindex="0" role="menubar" style="position: relative; width: auto; float: left;"> <li role="menuitem" class="static active" style="position: relative; float: left;">

please take note control menu @ master page , data loaded master page well


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