程序代码：

 private void button1_Click(object sender, EventArgs e)
        {
           if(this.radioButton1.Checked==true){
               MessageBox.Show(this.radioButton1.Text,"",MessageBoxButtons.OK);
           }
           else if (this.radioButton2.Checked == true)
           {
                MessageBox.Show(this.radioButton2.Text,"",MessageBoxButtons.OK);
           }else{
               MessageBox.Show(this.radioButton3.Text, "", MessageBoxButtons.OK);
           }
        }