How to read the sms from the usb dongle using C#

Question

This is the code I have tried.

SerialPort _serialPort = new SerialPort("COM5", 9600);
_serialPort.Parity = Parity.None;
_serialPort.DataBits = 8;
_serialPort.Handshake = Handshake.RequestToSend;
_serialPort.DtrEnable = true;
_serialPort.RtsEnable = true;
_serialPort.NewLine = Environment.NewLine;
_serialPort.Open();
_serialPort.Write("AT" + System.Environment.NewLine);
Thread.Sleep(1000);
_serialPort.WriteLine("AT+CMGF=1" + System.Environment.NewLine);
Thread.Sleep(1000);
_serialPort.WriteLine("AT+CMGL=\"ALL\"\r" + System.Environment.NewLine);
Thread.Sleep(3000);
string response = _serialPort.ReadExisting();
if (response.EndsWith("\r\nOK\r\n"))
{
Console.WriteLine(response);
}
else
{
Console.WriteLine(response);
}
Console.ReadLine();
String input = "Data Source=10.31.8.107;Initial Catalog=WR_CWM_PR_Barrel_Bearing;User ID=sa;Password=server#qtr#15";
Regex r = new Regex(@"\+CMGL: (\d+),""(.+)"",""(.+)"",(.*),""(.+)""\r\n(.+)\r\n");
Match m = r.Match(_serialPort.ReadExisting());
while (m.Success)
{
string a = m.Groups[1].Value;
string b = m.Groups[2].Value;
string c = m.Groups[3].Value;
string d = m.Groups[4].Value;
string s = m.Groups[5].Value;
string f = m.Groups[6].Value;
ListViewItem Item = new ListViewItem(new string[] { a, b, c, d, s, f });
listView1.Items.Add(Item);
m = m.NextMatch();
}