怪事!读不到TextBox控件修改后的内容……

我有一个页面，是用来修改之前录入数据的，但奇怪的是：当提交修改后，不能读取TextBox控件修改后的内容，依然是修改前的内容。请大家帮忙看看是什么原因……

代码如下：
    protected void Page_Load(object sender, EventArgs e)
    {
        GongChengFuKuan r = GongChengFuKuan.GetResume_FuKuanDengJi(int.Parse(Session["ShiGongHeTongFuKuanDengJiGuanLi_FuKuanDengJiID"].ToString()));
        TextBox1.Text = r.XuHao;
        TextBox2.Text = r.FuKuanShiJian;
        TextBox3.Text = r.JiLuZhuangTai;
        DropDownList1.SelectedValue = r.FuKuanFangShi;
        TextBox4.Text = r.FuKuanJinE;
        DropDownList2.SelectedValue = r.BiZhong;
        TextBox5.Text = r.HuiLu;
        TextBox6.Text = r.ZheSuanJinE;
        TextBox7.Text = r.ShouKuanDanWei;
        TextBox8.Text = r.KaiHuYinHang;
        TextBox9.Text = r.YinHangZhangHao;
        TextBox10.Text = r.JieSuanFangShi;
        DropDownList3.SelectedValue = r.PiaoJuLeiXing;
        TextBox11.Text = r.JingBanRen;
        TextBox12.Text = r.JieSuanDanHao;
        TextBox13.Text = r.PiaoJuHao;
        TextBox14.Text = r.JingBanShiJian;
        TextBox15.Text = r.BeiZhu;
    }
    protected void Button1_Click(object sender, EventArgs e)//提交修改
    {
        GongChengFuKuan FuKuanDengJi = new GongChengFuKuan();
        FuKuanDengJi.XuHao = TextBox1.Text.ToString().Trim();
        FuKuanDengJi.FuKuanShiJian = TextBox2.Text.ToString().Trim();
        FuKuanDengJi.JiLuZhuangTai = TextBox3.Text.ToString().Trim();
        FuKuanDengJi.FuKuanFangShi = DropDownList1.SelectedValue;
        FuKuanDengJi.FuKuanJinE = TextBox4.Text.ToString().Trim();
        FuKuanDengJi.BiZhong = DropDownList2.SelectedValue;
        FuKuanDengJi.HuiLu = TextBox5.Text.ToString().Trim();
        FuKuanDengJi.ZheSuanJinE = TextBox6.Text.ToString().Trim();
        FuKuanDengJi.ShouKuanDanWei = TextBox7.Text.Trim().ToString();
        FuKuanDengJi.KaiHuYinHang = TextBox8.Text.ToString().Trim();
        FuKuanDengJi.YinHangZhangHao = TextBox9.Text.ToString().Trim();
        FuKuanDengJi.JieSuanFangShi = TextBox10.Text.ToString().Trim();
        FuKuanDengJi.PiaoJuLeiXing = DropDownList3.SelectedValue;
        FuKuanDengJi.JingBanRen = TextBox11.Text.ToString().Trim();
        FuKuanDengJi.JieSuanDanHao = TextBox12.Text.ToString().Trim();
        FuKuanDengJi.PiaoJuHao = TextBox13.Text.ToString().Trim();
        FuKuanDengJi.JingBanShiJian = TextBox14.Text.ToString().Trim();
        FuKuanDengJi.BeiZhu = TextBox15.Text.ToString().Trim();
        GongChengFuKuan.UpdateFuKuanDengJi(FuKuanDengJi);
        //关闭子窗口并返回父窗口并模拟单击父窗口的Button13按扭引发其click事件，实现子窗口提交数据后即时异步刷新父窗口中的GridView控件
        Page.ClientScript.RegisterStartupScript(this.GetType(), "Test1", "<script>close();opener.document.all('Button13').click();</script>");
    }
    protected void Button2_Click(object sender, EventArgs e)//取消
    {
        Response.Write("<script>close()</script>");
    }