C#

string data = Convert.ToString(serialPort1.Read(buffer, 0, (int)buffer.Length));<br />
//read using a Stream<br />
string data1 = Convert.ToString(serialPort1.BaseStream.Read(buffer, 0, (int)buffer.Length));<br />

private void button1_Click(object sender, EventArgs e)
        {
            try
            {

                //configuring the serial port
                serialPort1.PortName = "COM6";
                serialPort1.Handshake = Handshake.None;
                serialPort1.BaudRate = 115200;
                serialPort1.DataBits = 8;
                serialPort1.Parity = Parity.None;
                serialPort1.StopBits = StopBits.One;
                serialPort1.DtrEnable = true;

                serialPort1.Open();
                
                string c = "AT+CMGS=";
                string c1 = "\"+6582083412\"\r\n";
                serialPort1.Write(c+c1);


                string d = "Test message from coded program ";
                //Now send the contents of the message
                serialPort1.Write(d);
                //SerialPortListen();
                char[] arr = new char[1];

                arr[0] = (char)26; //ascii value of Ctrl-Z

                serialPort1.Write(arr, 0, 1);
                
                //string data = Convert.ToString(serialPort1.Read(buffer, 0, (int)buffer.Length));
                //read using a Stream
                //string data1 = Convert.ToString(serialPort1.BaseStream.Read(buffer, 0, (int)buffer.Length));
               //MessageBox.Show(data + " part 2 is : " + data1);

                serialPort1.Close();

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }


        }