you can send sms web to mobile using serial port communication via gsm modem and code in given below.
sendsms sms = new sendsms();
sms.mysms(txtmobnum.Text, TXTMSG.Text);
SerialPort SMSPort = new SerialPort(COM5, 9600, Parity.None, 8, StopBits.One);
public void mysms(string mobile,string message)
{
string SerialIn = null;
byte[] RXBuffer = new byte[SMSPort.ReadBufferSize + 1];
if (!SMSPort.IsOpen)
{
SMSPort.Open();
SMSPort.WriteLine("AT+CMGF=" + "1" + (char)(13));
SMSPort.Read(RXBuffer, 0, SMSPort.ReadBufferSize);
SerialIn = SerialIn + System.Text.Encoding.ASCII.GetString(RXBuffer);
SMSPort.Write("AT+CMGS=" + "\"91" + mobile + "\"" + System.Environment.NewLine);
SMSPort.Read(RXBuffer, 0, SMSPort.ReadBufferSize);
SerialIn = SerialIn + System.Text.Encoding.ASCII.GetString(RXBuffer);
SMSPort.Write(message+ (char)(26));
SMSPort.Read(RXBuffer, 0, SMSPort.ReadBufferSize);
SerialIn = SerialIn + System.Text.Encoding.ASCII.GetString(RXBuffer);
SMSPort.Close();
}
}
[Edit]Code block added[/Edit]