How to get acknowledgement after sending sms successfully? - vb.net

Question

In my VB.Net Application, I have done with SMS sending using modem (dongle) as well as mobile phone connected to it.
I have done this using AT commands..
I need to show acknowledgement / response on the screen after sending the sms.
How can i do this ?
Some Code Snippet :
If IsOpen = True Then
SMSPort.Write("AT" & vbCr)
SMSPort.Write("AT+CSCS=""GSM""" & vbCr)
SMSPort.Write("AT+CMGF=1" & vbCr)
SMSPort.Write("AT+CMGS=""+91" & CellNumber & """" & vbCr)
_ContSMS = False
SMSPort.WriteLine(MyMessage & vbCrLf & Chr(26))
_Continue = False
RaiseEvent Sending(False)
End If

Answer 1

-you need to make a recieve data event;
Imports System
Imports System.IO.Ports
Class PortDataReceived
Public Shared Sub Main()
Dim mySerialPort As New SerialPort("COM1")
mySerialPort.BaudRate = 9600
mySerialPort.Parity = Parity.None
mySerialPort.StopBits = StopBits.One
mySerialPort.DataBits = 8
mySerialPort.Handshake = Handshake.None
AddHandler mySerialPort.DataReceived, AddressOf DataReceivedHandler
mySerialPort.Open()
Console.WriteLine("Press any key to continue...")
Console.WriteLine()
Console.ReadKey()
mySerialPort.Close()
End Sub
Private Shared Sub DataReceivedHandler(
sender As Object,
e As SerialDataReceivedEventArgs)
Dim sp As SerialPort = CType(sender, SerialPort)
Dim indata As String = sp.ReadExisting()
Console.WriteLine("Data Received:")
Console.Write(indata)
End Sub
End Class
And then you need to figure out how to get a acknowledgement with your provider and hardware.