protected void Btn_Update_Click(object sender, EventArgs e)
        {
            UselessDeviceModel uselessDevice = new UselessDeviceModel();
            int id = Int32.Parse(Request.QueryString["id"]);

            uselessDevice.setId(id);
            uselessDevice.setTypeId(Int32.Parse(this.TypeId.SelectedValue));
            uselessDevice.setDeviceName(this.DeviceName.Text);
            uselessDevice.setDeviceModel(this.DeviceModel.Text);
            uselessDevice.setDeviceFrom(this.DeviceFrom.Text);
            uselessDevice.setDeviceCount(Int32.Parse(this.DeviceCount.Text));

            if (UselessDeviceDAO.UpdateUselessDevice(uselessDevice))
            {
                Response.Write("<script>alert('更新成功!');location.href='UselessDeviceManage.aspx';</script>");
            }
            else
            {
                Response.Write("<script>alert('更新失败!');</script>");
            }
        }