//EVENT HANDLERS

        private void ButtonUpdateEntry_Click(object sender, EventArgs e)
        {
            try
            {
                var row = dataGridViewInventory.CurrentRow;

                if (row == null)
                {
                    throw new Exception("Please select an entry to update");
                }
                else
                {
                    Service service = new Service()
                    {
                        ServiceId    = (int)row.Cells[0].Value,
                        ServiceName  = (string)row.Cells[1].Value,
                        ServicePrice = (decimal)row.Cells[2].Value,
                        ProductId    = (int)row.Cells[3].Value
                    };

                    AddOrUpdateServiceForm updateServiceForm = new AddOrUpdateServiceForm(service);
                    HandleForm(updateServiceForm);
                }
            }
            catch (Exception err)
            {
                MessageBox.Show(err.Message);
            }
        }
        private void ButtonNewEntry_Click(object sender, EventArgs e)
        {
            AddOrUpdateServiceForm addServiceForm = new AddOrUpdateServiceForm();

            HandleForm(addServiceForm);
        }