private void button3_Click(object sender, EventArgs e)
{
int deviceID = int.Parse(textBox2.Text.Trim());
string cardID = txtCardNum.Text.Trim();
byte[] temp = CmdHelper.GenerateExamCommitCmd(deviceID, null);
for (int i = 0; i < 3; i++)
{
serialPort.SendData(temp, 0, temp.Length); //提交考试
}
}