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C#窗体编程问题!

编的选择题窗体为什么在执行但却并没有选择时就出现而不是???

要怎样改才能让它执行时出现的是这样的界面??

 

追问:string an;
        private void radioButton1_CheckedChanged(object sender, EventArgs e)
        {
            an = "yes";
        }

        private void radioButton2_CheckedChanged(object sender, EventArgs e)
        {
            an = "no";
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (rb1.Checked == false && rb2.Checked == false)
            {
                MessageBox.Show("请选择!");
            }
            else if (rb1.Checked == false && rb2.Checked == true)
            {
                MessageBox.Show("您获得0分!");
            }
            else
            {
                MessageBox.Show("您获得1分,请记录!");
            }
        }

那个checked的属性已经改了啊!

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