Request.UrlReferre---返回上一頁面

 private string PrUrl
  {
            set
            {
                ViewState["prUrl"]=value;
            }
            get
            {
                return Convert.ToString(ViewState["prUrl"]) ?? "缺省跳轉到的頁面";
            }
}

protected void Page_Load(object sender, EventArgs e)
 {
            if (!IsPostBack)
            {
                PrUrl = Request.UrlReferrer.ToString();
            }
 }
 protected void btnReturn_Click(object sender, EventArgs e)
  {
            Response.Redirect(PrUrl);
  }

-------關於“返回上一頁面”功能可以使用Request.UrlReferre屬性作返回操作