Read sms using serial port communication in c#

[ghjk]

I want to read sms from GSM modem using C# in serial communication. I wrote the code. But i want to do it automatically. I put my code here and please tell me how can i do it automatically.

[PHP] public partial class SMS : Form
{

//create an Serial Port object
SerialPort sp = new SerialPort();

public SMS()
{
InitializeCompo nent();
}

private void Form1_Load(obje ct sender, EventArgs e)
{

}

private void btnStart_Click( object sender, EventArgs e)
{
sp.BaudRate = 19200;


try
{
//Open serial port
sp.PortName = "COM1";
sp.Open();

}
catch (System.Excepti on ex)
{
lblError.Text = ex.Message;
}
}

private void btnWrite_Click( object sender, EventArgs e)
{

try
{

//Write line to serial port
sp.WriteLine(te xSms.Text + "\r");
texSms.Text = "";
sp.DiscardInBuf fer();

}
catch(System.Ex ception ex)
{
lblError.Text = ex.Message;
}

//Set time delay
//System.Threadin g.Thread.Sleep( 30);
// sp.WriteTimeout = 200;


}



private void btnRead_Click(o bject sender, EventArgs e)
{
try
{
//Cler text box

//Read serial port and displayed the data in text box
texSms.Text = sp.ReadLine();
//sp.Write("Conne cted" + "\n");

}
catch (System.Excepti on ex)
{
lblError.Text = ex.Message;
}

}


private void SMS_formClosing (object sender, FormClosingEven tArgs e)
{
MessageBox.Show ("Do u want to Close the App");
sp.Close();
}

private void btnStop_Click(o bject sender, EventArgs e)
{
texSms.Text = "";
sp.Close();
}


}[/PHP]