private void button1_Click(object sender, System.EventArgs e) { if (comboBox1.SelectedItem == comboBox2.SelectedItem) { MessageBox.Show("Symbols cannot be the same.", "Duplication error", MessageBoxButtons.OK, MessageBoxIcon.Information); } if (textBox1.Text == textBox2.Text) { MessageBox.Show("Player names cannot be the same.", "Duplication error", MessageBoxButtons.OK, MessageBoxIcon.Information); } if (textBox1.Text.Equals(string.Empty) || textBox2.Text.Equals(string.Empty)) { MessageBox.Show("Please enter a name.", "Missing names", MessageBoxButtons.OK, MessageBoxIcon.Information); } this.Hide(); var multyPlayer = new GameBoardView(); multyPlayer.ShowDialog(); this.Close(); }