private void button1_Click(object sender, EventArgs e) { if (foodNameTextBox.Text == "" || priceTextBox.Text == "" || statusTextBox.Text == "") { MessageBox.Show("Fill up the required from"); } else { MenuService menuService = new MenuService(); int result = menuService.AddFood(foodNameTextBox.Text, priceTextBox.Text, statusTextBox.Text, categoryName_ComboBox.Text); if (result > 0) { MessageBox.Show("Added Successfully"); this.Refresh(this, null); this.Clear(this, null); } else { MessageBox.Show("Error occur!"); } } }