private void btnSubmit_Click(object sender, EventArgs e) { if (tbPlayer.Text.Length < 2) { return; } //Check xem đã nối đúng chưa this.btnSubmit.Enabled = false; string NPC = rtbNPC1.Text; string Player = tbPlayer.Text; if (game.CheckAnswer(NPC, Player) == true) { Correct(); UsedWord.Add(Player); } else { Lose(); } }