.net 中继承Page页面

 public partial class Page1 : System.Web.UI.Page
    {
        public Page1() { }
        protected override void OnInit(EventArgs e)
        {
            base.OnInit(e);
            if (this.Session["user_id"] == null)
            {
                this.Response.Redirect("/errorPage.aspx");
            }
            else
            {
                this.Response.Write(this.Request.Path);
            }
        }
        
    }

而其它页面就可以继承Page1
public partial class XXX : Package.of.you.Page1
{
      .........
}