How to send SMS in asp.net using Twilio

In this article I am going to explain how to send SMS in asp.net using Twilio.

In the previous article I have explained how to display file icons according tofile extensions in asp.net, how to do sorting in gridview data control usingJquery and how to open (view) all type of files (images, word document, excel,PDF etc.) with associate program in asp.net.

Description:

I am using Twilio API to send sms.

Implementation:

First of all create a account on Twilio and verify your phone number. Now configure a number for messaging. You can also buy a preferred number.

Why we need to configure a number?

We can’t use the verified number to send SMS.

HTML Markup:

  <table>

    <tr><td>Number :</td><td>

        <asp:TextBox ID="txtnumber" runat="server" Width="180px"></asp:TextBox></td></tr>

         <tr><td></td><td></td></tr>

     <tr><td>Message :</td><td>

         <asp:TextBox ID="txtmessage" runat="server" TextMode="MultiLine" Width="180px" Height="200px"></asp:TextBox></td></tr>

          <tr><td></td><td></td></tr>

      <tr><td></td><td>

          <asp:Button ID="btnsend" runat="server" Text="Send Message"/></td></tr>

       <tr><td></td><td></td></tr>

    </table>

Add Twilio DLL

Now add the Twilio DLL to project. Here I will add this to project through Nuget. Run the below command in Package manager console:

                  Install-package twilio

Import the namespace

C# Code:

using Twilio;

VB.net Code:

Imports Twilio

Send SMS

Write the below code on button click to send SMS.

C# Code:

protected void btnsend_Click(object sender, EventArgs e)

    {

        try

        {

            string AccountSID = "Account SID";

            string Token = "AUTH TOKEN";

            var twilio = new TwilioRestClient(AccountSID, Token);

            string number = "+91" + txtnumber.Text;

            var message = twilio.SendMessage("+13183901909", number, txtmessage.Text);

        }

        catch (Exception ex)

        { }

    }

VB.net Code:

   Protected Sub btnsend_Click(sender As Object, e As System.EventArgs) Handles btnsend.Click

        Dim AccountSID As String = "Account SID"

        Dim Token As String = "AUTH TOKEN"

        Dim twilio = New TwilioRestClient(AccountSID, Token)

        Dim number As String = "+91" + txtnumber.Text

        Dim message = twilio.SendMessage("+13183901909", number, txtmessage.Text)

    End Sub

You have done it. Now build and run the application. To test it send sms to your mobile number.

Note: Trial account will send SMS to verified phone number.