Repeated sending and reciveing of data from serialport with timer

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C#

Hi..


I have 3 forms,form1,form2 and form3. I have to perform following things

1. Send data from form1 to serial port.

2. when form1 get value '1', show second form.
3. when click a button in form2 show form3.
4. when click a send button call a function in form1 and send data to serial port.
5. Wait for response.
6. When get a response again send data without clicking the button.
7. wait for response.
8. When get a response again send data without clicking the button.
9. continues this procedure so many times

But my problem is that how can I manage this with timer. after getting acknowledgement am sending next data and I stop the timer. But when I get acknowledgement I cant send data, because I already stopped the timer. Is there any solution to this?

code in form3


 private void button1_Click(object sender, EventArgs e)
    {
        int temp =Convert.ToInt32( comboBox1.Text);
        if (comboBox1.Text == "25")
        {
            tempp[0] = 0;

        }
        else if (comboBox1.Text == "30")
        {
            tempp[0] = 1;
        }
        else if (comboBox1.Text == "37")
        {
            tempp[0] = 2;
        }
        int filter = Convert.ToInt32(comboBox2.Text);
        int asp = Convert.ToInt32(textBox1.Text);
        int prnt = Convert.ToInt32(textBox2.Text);
        int abs = Convert.ToInt32(textBox3.Text);
        byte[] cmdt = BitConverter.GetBytes(Form1.SETTEMPERATURE);
        byte[] nn = BitConverter.GetBytes(Form1.SETFILTER);
        byte[] len = new byte[1];
        byte[] ERR = new byte[1];
      // byte[] val = new byte[1];
       len[0] = 3;
       ((Form1)this.Owner).SerialPortValueUpdated(len, cmdt, ERR, tempp);

    }

    private void Filter_Load(object sender, EventArgs e)
    {
        timer1.Start();
    }


    private void timer1_Tick(object sender, EventArgs e)
    {
        if (Form1.tflag == 1&&Form1.filflag==0)
        {
            label7.Text = "FILTER...";
              rrr = 1;
        }
        if (Form1.filflag == 1&&Form1.tflag==0)
        {

            label7.Text = "ACK...";
            fltflag = 1;
        }
                  // }
        if (rrr == 1)
        {
           // Form1.tflag = 0;

            byte[] nn = BitConverter.GetBytes(Form1.SETFILTER);
            byte[] len = new byte[1];
            byte[] ERR = new byte[1];
            byte[] val = new byte[1];
            len[0] = 3;
            ((Form1)this.Owner).SerialPortValueUpdated(len, nn, ERR, val);
             timer1.Stop();
        }
        if (fltflag == 1)
        {
            Form1.filflag = 0;
          byte[] nn = BitConverter.GetBytes(Form1.GETRAWADS);
            byte[] len = new byte[1];
            byte[] ERR = new byte[1];
            byte[] val = new byte[1];
            len[0] = 3;
            ((Form1)this. Owner).SerialPortValueUpdated(len, nn, ERR, val);

        }
     }