1.构造一个函数，继承System.Web.UI.Page

/// 
    /// Brand的构造函数    /// 
    public class CBrandBaseBage : System.Web.UI.Page    {       protected string BrandId;       public CBrandBaseBage()       {            //ShowPage(); showpage给子类用，如果子类用session[""]=""会提示page里缺少httpmodule的statues            //this.Init += new EventHandler(Page_Init);             this.Load += new EventHandler(BasePage_Load);        }       private void BasePage_Load(object sender, EventArgs e)       {           ShowPage();//showpage要放在load里面才能正常使用session           //判断是否存在该品牌BrandId                  }       //抛出一个方法给子类重写       protected virtual void ShowPage()       {           //虚方法代码       }

2.子页面继承

//父类虚方法，在Init之前执行        protected override void ShowPage()        {            //base.ShowPage();            Id = Function.SqlFilter(DtRequest.GetQueryInt("ID", 0).ToString());            if (Id == "0") return;            if (string.IsNullOrEmpty(Id)) return;            if (System.Web.HttpContext.Current == null) return;            HttpContext.Current.Session["bid"] = Id;            HttpContext.Current.Session.Timeout = 45;            Function.WriteCookie("bid", "ZT", Id);        }