private void btnSave_Click(object sender, EventArgs e)
        {
            VIPTypeInfo vip = new VIPTypeInfo();

            vip.MTitle    = txtTitle.Text;
            vip.MDiscount = Convert.ToDecimal(txtDiscount.Text);
            if (txtId.Text == "添加时无编号")
            {
                //添加功能
                btnSave.Text = "添加";
                if (bll.Add(vip))
                {
                    MessageBox.Show("添加成功!");
                    Refresh();
                }
                else
                {
                    MessageBox.Show("添加失败,请稍后重试!");
                    Refresh();
                }
            }
            else
            {
                //修改功能
                vip.MId = Convert.ToInt32(txtId.Text);
                if (bll.Edit(vip))
                {
                    MessageBox.Show("修改成功!");
                    Refresh();
                }
                else
                {
                    MessageBox.Show("修改失败!请稍后重试");
                    Refresh();
                }
            }
        }