private void ComboBoxItemName_Leave(object sender, EventArgs e)
 {
     if (!ComboBoxItemName.Items.Contains(ComboBoxItemName.Text))
     {
         DialogResult result = MessageBox.Show("the item does not exist, would you like to add a new item?", "Confirmation", MessageBoxButtons.YesNo);
         if (result == DialogResult.Yes)
         {
             NewService NewServiceObj = new NewService(ComboBoxVehicleModel.Text.Trim(), ComboBoxVehicleName.Text.Trim(), ComboBoxItemName.Text.Trim());
             NewServiceObj.ShowDialog();
             getItemsData();
             ComboBoxItemName.Text = "";
             ComboBoxItemName.Focus();
         }
         ComboBoxItemName.Text = "";
     }
 }
        private void ButtonNewService_Click(object sender, EventArgs e)
        {
            NewService NewServiceObj = new NewService();

            NewServiceObj.ShowDialog();
        }