代码如下：

private void textBox1_TextChanged(object sender, EventArgs e)
{
    keko.Open();

    MySqlCommand cmd = new MySqlCommand("Select * from giris_cikis where RFID='" + textBox1.Text + "' AND Tarih='" + DateTime.Now.ToShortDateString() + "'", keko);
    MySqlDataReader dr = cmd.ExecuteReader();
    if (dr.Read())
    {
        if (dr["Cikis"].ToString() == "")
        {
            keko.Close();
            keko.Open();
            MySqlCommand kmt = new MySqlCommand("Update giris_cikis set Cikis='" + DateTime.Now.ToShortTimeString() + "' where RFID='" + textBox1.Text + "' AND Tarih='" + DateTime.Now.ToShortDateString() + "'", keko);
            kmt.ExecuteNonQuery();
        }
        else
        {
            MessageBox.Show("Zaten çıkış yaptınız!");
        }
    }
    else
    {
        keko.Close();
        keko.Open();
        MySqlCommand ara = new MySqlCommand("Select * from rfid where rfid='" + textBox1.Text + "'", keko);
        MySqlDataReader arad = ara.ExecuteReader();
        if (arad.Read())
        {
            string a = arad["Adi"].ToString();
            string b = arad["Soyadi"].ToString();
            keko.Close();
            keko.Open();

            MySqlCommand kmt = new MySqlCommand("Insert into giris_cikis (Adi,Soyadi,Tarih,Giris,RFID) values ('" + a + "','" + b + "','" + DateTime.Now.ToShortDateString() + "','" + DateTime.Now.ToShortTimeString() + "','" + textBox1.Text + "')", keko);
            kmt.ExecuteNonQuery();
        }
    }
    keko.Close();
}

private void timer1_Tick(object sender, EventArgs e)
{
    textBox1.Text = serialPort1.ReadLine();
}

当我调试这个，调试窗口冻结我应该怎么做？
有人认识阿杜尼奥吗？如果你愿意，我可以给你arduino密码。
我想做一个自动化系统，但不起作用。
有一个计时器，当它滴答作响时间隔1500 textbox1.text = serialport1.readline(); 但它冻结了。 Serialport 在中打开 form1_load .