how to handle event of repeater control(rptSubMenu_ItemCommand) from master page into aspx

Hello All,
 protected void rptSubMenu_ItemCommand(object source, RepeaterCommandEventArgs e)
        {
            if (e.CommandName.Equals("Submodulename"))
            {
                LinkButton lnkbtn = (LinkButton)e.Item.FindControl("lnkSubMenu");
                Session["SubModuleName"] = lnkbtn.Text;                               
            }

        }
this event is wriiten in master pag ...