private void repairB_Click(object sender, EventArgs e)
        {
            if (plateNumberCB.Text == "")
            {
                MessageBox.Show("Please choose a PLATE NUMBER", "ERROR", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
            else if (partCB.Text == "")
            {
                MessageBox.Show("Please choose a VEHICLE PART/n If VEHICLE PART does exist on the choices, please ADD a NEW PART.", "ERROR", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
            else
            {
                _maintenanceID = _maintenance.CreateMaintenanceID();
                _repairID      = _repair.CreateRepairID();
                _plateNumber   = plateNumberCB.Text.Trim();
                _partID        = _part.RetrievePartID(partCB.Text.Trim());
                _maintenance   = new Maintenance(_maintenanceID, _plateNumber, _partID, _status);
                _maintenance.InsertMaintenance(_maintenance);
                plateNumberCB.Text = "";
                partCB.Text        = "";
            }
            NewRepairForm newRepairForm = new NewRepairForm();

            newRepairForm.ShowDialog();
            Close();
        }