if (checkBox1.CheckState == CheckState.Checked)
            {
                MessageBox.Show("checkbox1 is checked\n" + checkBox1.Text  );
            }
            else if (checkBox1.CheckState == CheckState.Unchecked)
            {
                MessageBox.Show("checkbox1 is Unchecked\n" + checkBox1.Text);
            }
            else
 

            {
                MessageBox.Show("checkBox1 控制元件處於不確定狀態");
            }
            //...