SMS Sender and Notification in VB.NET

SMS Sender and Notification in VB.NET

Problem

Create a Windows Form Application program in Visual Basic.Net that will allow users to send SMS Notifications.

Description

This tutorial will allow the user to input their message in the text box and a receiver’s contact number to another text box. The message contained in the text box is sent to receiver’s contact number once the send button was clicked.

Before the tutorial the following are required to start:

  • Microsoft Visual Studio 2008 – Above
  • Broadband Stick/USB Modem

The tutorial starts here:

  1. Insert the Broadband Stick/USB Modem to the USB Port
  2. Open Microsoft Visual Studio 2012
  3. Select a New Project on the File menu.
  4. Select Visual Basic, Windows Form Application then click OK.
  5. We need to design our form by the following controls:
  • 2 Labels – labels for the Phone Number Text box and Message text box
  • 2 Text box – text boxes for the Phone Number and Message.
  • 2 Command button – 1 button to send the message to the receiver and 1 button to cancel/close the form
  • 2 Status strip label – label to show the status of the Port
  1. We will also name our form controls in this way:
  • txtPhoneNumber is the name of the textbox for Phone Number
  • txtMessage is the name of the textbox for Messages
  • cmdSend is the name of the button for Send
  • cmdCancel is the name of the button for Cancel
  • ToolStripStatusLabel1 is the name of the first StatusStripLabel
  • ToolStripStatusLabel2 is the name of the second StatusStripLabel
  1. This is how we design the form. (Feel free to layout your own)
SMS Notification and Sender in VB.Net Form Design
SMS Notification and Sender in VB.Net Form Design

Figure 1. Design of the Form

  1. Double click the window form and paste the following code below.

Code here

Imports System.Management
Imports System.Threading
Imports System.IO.Ports
Imports System.IO
Public Class Form1
    Public Function ModemsConnected() As String
        Dim modems As String = ""
        Try
            Dim searcher As New ManagementObjectSearcher( _
                "root\CIMV2", _
                "Select * from Win32_POTSModem")
            For Each queryobj As ManagementObject In searcher.Get()
                If queryobj("Status") = "OK" Then
                    modems = modems & queryobj("AttachedTo") & "-" & queryobj("Description") & "***"
                End If
            Next
        Catch ex As Exception
        End Try
        Return modems
    End Function

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        Try
            Dim ports2() As String
            ports2 = Split(ModemsConnected(), "***")
            For i As Integer = 0 To ports2.Length - 2
                Dim port_des As String = (ports2(i))
                Dim gg As String = port_des
                gg = Trim(Mid(port_des, 1, 5))
                Dim cleanstring As String = Replace(gg, "-", "")
                With SerialPort1
                    .PortName = cleanstring
                    .BaudRate = 115200
                    .Parity = Parity.None
                    .StopBits = StopBits.One
                    .DataBits = 8
                    .Handshake = Handshake.RequestToSend
                    .DtrEnable = True
                    .RtsEnable = True
                    .NewLine = vbCrLf
                    .Open()
                    ToolStripStatusLabel2.Text = "Connected."
                    ToolStripStatusLabel2.ForeColor = Color.Green
                End With
            Next
        Catch ex As Exception
            ToolStripStatusLabel2.Text = "Disconnected."
            ToolStripStatusLabel2.ForeColor = Color.Red
        End Try
    End Sub

End Code

Code Explanation:

The code above will load and connect the connection from the broadband stick/USB Modem, and also can automatically update the Port for the connection between the device and the Broadband Stick/ USB Modem. It also change the appearance of the ToolStripStatusLabel2 to indicate if the device is connected.

  1. Double click the Cancel Button and paste the following code.

Code here

Private Sub cmdCancel_Click(sender As Object, e As EventArgs) Handles cmdCancel.Click
        Me.Dispose()
End Sub

End Code

Code Explanation:

The code above will clear all the contents and exit the form.

  1. Double click the Send Button and paste the following code.

Code here

Private Sub cmdSend_Click(sender As Object, e As EventArgs) Handles cmdSend.Click
        Try
            If SerialPort1.IsOpen Then
                With SerialPort1
                    .Write("AT" & vbCrLf)
                    .Write("AT+CMGF=1" & vbCrLf)
                    .Write("AT+CMGS=" & Chr(34) & txtPhoneNumber.Text & Chr(34) & vbCrLf)
                    .Write("[THIS IS SYSTEM GENERATED PLEASE DO NOT REPLY!]" & Environment.NewLine & txtMessage.Text & Chr(26))
                End With
            Else
                MsgBox("Broadband is not Connected!", MsgBoxStyle.Exclamation, "Error")
                txtMessage.Focus()
            End If
        Catch ex As Exception
            txtMessage.Focus()
        End Try
    End Sub

End Code

Code Explanation:

The code will send the message contained in the txtMessage text box to the Contact Number contained at the txtPhoneNumber text box. It can also indicate whether the device is connected to the broadband stick/USB Modem.

SMS Notification and Sender in VB.Net Final Output
SMS Notification and Sender in VB.Net Final Output

­­­Conclusion:

This code snippets in vb.net will allow you to send a text to any phone number as long as the broadband has a load or balance. The application of this code can also be used to generate auto responses such as the grade inquiry and others. The project and source code is available for download and you may modify it based on your preferences and requirements.

Author:

Name: Charlie Devera
Email Address: [email protected]

Free Download Source code (SMS Sender and Notification in VB.Net)

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