cs.Show();
        }
        private void MR_UserItem_Click(object sender, EventArgs e)
        {
            UserSearch us = new UserSearch();
            us.Show();
        }
        private void MR_CarItem_Click(object sender, EventArgs e)
        {
            CarSearch cars = new CarSearch();
            cars.Show();
        }
        private void MD_CustomerItem_Click(object sender, EventArgs e)
        {
            ShowDataManager('c');
        }

        private static void ShowDataManager(char ch)
        {
            DataManager dm = new DataManager(ch);
            dm.Show();
        }
        private void MD_UserItem_Click(object sender, EventArgs e)
        {
            ShowDataManager('u');
        }
        private void MD_CarItem_Click(object sender, EventArgs e)
        {
            ShowDataManager('q');
        }
        private void MM_CarItem_Click(object sender, EventArgs e)
        {
            SellOutCar soc = new SellOutCar(Convert.ToInt32(ul.loginNum));
            soc.Show();           
        }
        private void MC_ReserveItem_Click(object sender, EventArgs e)
        {
            PreserveList pl = new PreserveList();
            pl.Show();
        }
        private void MC_BuyItem_Click(object sender, EventArgs e)
        {
            BuyList bl = new BuyList();
            bl.Show();
        }
        private void MSS_UserItem_Click(object sender, EventArgs e)
        {
            UserScore us = new UserScore();
            us.Show();
        }
        private void MSS_SellItem_Click(object sender, EventArgs e) C#汽车销售系统财务管理和销售管理设计(14):http://www.youerw.com/jisuanji/lunwen_2321.html