private void button1_Click(object sender, EventArgs e) { GamerControl control = new GamerControl(); if ((textBox1.Text != null) && (textBox2.Text != null) && (comboBox1.SelectedIndex > -1) && (comboBox2.SelectedIndex > -1) && (textBox3.Text != null) && (comboBox3.SelectedIndex > -1)) { control.AddGamer(textBox1.Text, textBox2.Text, Convert.ToBoolean(comboBox1.SelectedIndex), Convert.ToBoolean(comboBox2.SelectedIndex), Convert.ToDouble(textBox3.Text), comboBox3.SelectedItem.ToString()); this.Hide(); } else { label7.Visible = true; } }