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此方法并非History.go(-1)，因为History.go(-1)方法页面不会重新绑定

 protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            ViewState["BackUrl"] = Request.UrlReferrer.ToString();
        }
    }
    protected void LinkButton1_Click(object sender, EventArgs e)
    {
        Response.Redirect(ViewState["BackUrl"].ToString());
    }