private void btnAddCar_Click(object sender, EventArgs e) { var regNo = txtReg.Text.ToUpper(); //Validate data if (txtMake.Text.Equals("")) { MessageBox.Show("Car make must be entered", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); txtMake.Focus(); return; } if (!isValidMakeModel(txtMake.Text)) { MessageBox.Show("Invalid Make", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); txtMake.Focus(); return; } if (!isValidMakeModel(txtModel.Text)) { MessageBox.Show("Invalid Model", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); txtModel.Focus(); return; } if (txtModel.Text.Equals("")) { MessageBox.Show("Car model must be entered", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); txtModel.Focus(); return; } if (!isValidReg(txtReg.Text)) { MessageBox.Show("Car Registration is invalid. NN(N)-XX-N(NNN) ", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); txtReg.Focus(); return; } //check if RegNo already exists if (Cars.checkRegExists(regNo)) { MessageBox.Show("Registration number already exists", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); txtReg.Focus(); return; } if (cboCarCategory.Text.Equals("")) { MessageBox.Show("Chose a car category", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); cboCarCategory.Focus(); return; } if (cboFuelType.Text.Equals("")) { MessageBox.Show("Chose fuel type", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); cboFuelType.Focus(); return; } if (cboTransmission.Text.Equals("")) { MessageBox.Show("Chose transmission", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); cboCarCategory.Focus(); return; } if (rad2door.Checked) { doors = 2; } else if (rad4door.Checked) { doors = 4; } else { MessageBox.Show("Chose number of doors", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); rad2door.Focus(); return; } var extra = ""; if (chkAddCar.CheckedItems.Count > 0) { for (var i = 0; i < chkAddCar.CheckedItems.Count; i++) { if (extra == "") { extra = chkAddCar.CheckedItems[i].ToString(); } else { extra += "," + chkAddCar.CheckedItems[i]; } } } //Save data in file var addCar = new Cars(txtMake.Text, txtModel.Text, cboCarCategory.Text, txtReg.Text, cboTransmission.Text, cboFuelType.Text, 0, "A", Convert.ToInt32(numericUpDownSeats.Text), Convert.ToInt32(doors), extra, Convert.ToDecimal(numericUpEngine.Text), Convert.ToInt32(numericUpBags.Text)); //INSERT car record into cars table addCar.addCars(); //Display confirmation MessageBox.Show("Car with Reg " + txtReg.Text + " has been added", "Success", MessageBoxButtons.OK, MessageBoxIcon.Information); //Reset UI txtMake.Clear(); txtModel.Clear(); txtReg.Clear(); numericUpBags.ResetText(); numericUpEngine.ResetText(); numericUpDownSeats.ResetText(); chkAddCar.ClearSelected(); txtMake.Focus(); }