private void AddPlayerButton_Click(object sender, EventArgs e) { string currentUserName = UserNameTextBox.Text; if (currentUserName == "") { MessageBox.Show("Please enter a Name"); return; } if (!PlayerList.DoesPlayerExist(currentUserName)) { listBox1.Items.Add(PlayerList.NumberOfPlayers + ") " + currentUserName); Player newPlayer = new Player(currentUserName); PlayerList.AddPlayerInVector(newPlayer); UserNameTextBox.Clear(); if (PlayerList.IsGameFull()) { AddPlayerButton.Hide(); UserNameTextBox.Hide(); } if (PlayerList.AreEnoughPlayers()) { StartButton.Show(); } } else { MessageBox.Show("This username is already used"); } }