private void drinkUpdateBtn_Click(object sender, EventArgs e) { if (boxId.Text == "" || drinkNameBox.Text == "" || drinkPriceBox.Text == "" || drinkAmountBox.Text == "") { // show a message if a user did not enter a value MessageBox.Show("Please enter a value for all fields before clicking on Update", "", MessageBoxButtons.OK, MessageBoxIcon.Information); } else { // reading data from the textboxes int id = int.Parse(boxId.Text); string name = drinkNameBox.Text; decimal price = decimal.Parse(drinkPriceBox.Text); int amount = int.Parse(drinkAmountBox.Text); // passing data to the UI layer SomerenUI.uppdateBarServiceUI(id, name, price, amount); // show a messagebox after clicking on update button MessageBox.Show("You have successfully updated a drink!!\n" + "Enter Refresh the list to see the changes", "", MessageBoxButtons.OK, MessageBoxIcon.Information); } // clearing data from textboxes drinkAmountBox.Clear(); drinkNameBox.Clear(); drinkPriceBox.Clear(); boxId.Clear(); }