public void AddCarDealership()
        {
            var mockSet = new Mock <DbSet <CarDealership> >();

            var mockContext = new Mock <CarDealershipContext>();

            mockContext.Setup(m => m.CarDealerships).Returns(mockSet.Object);

            var service = new CarDealershipBusiness(mockContext.Object);

            service.Add(new CarDealership());

            mockSet.Verify(m => m.Add(It.IsAny <CarDealership>()), Times.Once());
            mockContext.Verify(m => m.SaveChanges(), Times.Once());
        }
        //cbGet and cbSort//

        //Buttons + attached logic//
        private void btnAdd_Click(object sender, EventArgs e)
        {
            var name = txtName.Text;

            int.TryParse(txtTown.Text, out int town);

            CarDealership carDealership = new CarDealership();

            carDealership.Name   = name;
            carDealership.TownId = town;

            CarDealershipBusiness carDealershipBusiness = new CarDealershipBusiness();

            carDealershipBusiness.Add(carDealership);
            PopulateDataGridViewDefault();
            ClearTextBoxes();
        }