c# - Web Usercontrol menu item dynamic selected style not working -

i have web user control,it include menu.it have 4 menu items,i using style sheet dynamic , static selected style.but static , dynamic selected style not working.how solve problem

2, codebehind of menuitemclick event:

protected void menu1_menuitemclick(object sender, menueventargs e) {     session["selected"] = e.item.text;     if (e.item.text == "page1")     {         response.redirect("~/menu/default.aspx");     }     else if(e.item.text == "page2")     {         response.redirect("~/menu/default2.aspx");     }     else if (e.item.text == "page3")     {         response.redirect("~/menu/default3.aspx");     } } 

page load on user control

protected void page_load(object sender, eventargs e) {     if (session["selected"] != null)     {         (int = 0; < this.menu1.items.count; i++)         {             if (this.menu1.items[i].text == session["selected"].tostring())             {                 this.menu1.items[i].selected = true;             }         }     } }