private void carsAddBtn_Click(object sender, EventArgs e) { if (loggedUser == "Admin") { using (CarEdit frm = new CarEdit()) { if (frm.ShowDialog() == DialogResult.OK) { if (dbm.CreateCar(Convert.ToInt32(frm.enginePowerNumericUpDown.Value), Convert.ToDouble(frm.fuelEffNumericUpDown.Value), Convert.ToInt32(frm.resourseNumericUpDown.Value), Convert.ToDouble(frm.weightNumericUpDown.Value)) != null) { MessageBox.Show("OK", "Info", MessageBoxButtons.OK, MessageBoxIcon.Information); } else { MessageBox.Show("Error", "Info", MessageBoxButtons.OK, MessageBoxIcon.Error); } carsDataGridView.DataSource = context.cars.ToList(); } } } else { MessageBox.Show("Access Denied", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); } }