private void button1_Click(object sender, EventArgs e)
        {

           //学习checkbox
            //checkbox是否选中标志checkstate
            checkBox1.CheckState = CheckState.Checked;
            MessageBox.Show("checkbox当前状态"+checkBox1.CheckState);

            //
            if (radioButton1.Checked==true)
            {
                //当选中radiobutton
                MessageBox.Show("选中了radiobutton1");
            }
        }

        //checkbox_checkstatechanged 事件表示checkbox状态变动事件
        private void Form1_Load(object sender, EventArgs e)
        {
            checkBox1.CheckState = CheckState.Unchecked;
            MessageBox.Show("checkbox未选中");
  
        }

        //radiobutton状态变化事件
        private void radioButton1_CheckedChanged(object sender, EventArgs e)
        {
            MessageBox.Show("radiobutton1当前状态为"+ radioButton1.Checked);
        }