serial port read c#

[darkking]

Ok,

I'm trying to read data from the serial port. Problem is, that i always have to query the port for new data, and in 99.9% of acses my query doesn't return the result cause of the fact it's done when the modems is seding the answers.

I've tried using a timer, but still i get errors. Same while using DTR enable/false. How i can safely send the query without getting over the momdem response ?

I'm using DataRecived event, to read the com.

private void portserial_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            while (portserial.BytesToRead > 0)
            {
                data += Convert.ToChar(portserial.ReadByte());
            }
        }

and on start read button i have:

function name....
        {
            string temp;
            string sms; int j; int k; int indx = 0;
            string[] sirNr = new string[250];
            lRuleaza = true;
            try
            {
                //MessageBox.Show(portserial.DtrEnable.ToString());
                portserial.Write("at+cmgl=\"ALL\"\r"); //the command i try to send without affecting the reading.
 
....parse the info read....
}

Thanks :)