​

Set up your .NET Core dev environment

You must set up and install .NET Core and Plivo’s .NET SDK before you send your first message.

​

Install .NET Core

You can check whether you already have .NET Framework installed under macOS or Linux and what version is installed by running the command dotnet --version in a terminal window. Under Windows there are several ways to check. If you don’t have it or need a more current version, download and install it.

​

Install the Plivo .NET SDK

Create a projects directory and change into it.

$ mkdir mydotnetcoreapp
$ cd mydotnetcoreapp

Install the Plivo SDK using the .NET CLI.

$ dotnet new console
$ dotnet add package Plivo

Once you’ve set up your development environment, you can start sending and receiving messages using PHLO, our visual workflow design studio, or using our APIs and XML documents. Here are three common use cases to get you started.

​

Send your first outbound SMS/MMS message

You can create and deploy a PHLO to send an outbound text message with just a few clicks on the PHLO canvas, and trigger it with some simple code.

​

Create the PHLO

To create a PHLO, visit the PHLO page of the Plivo console. If this is your first PHLO, the PHLO page will be empty.

• Click Create New PHLO.

• In the Choose your use case pop-up, click Build my own. The PHLO canvas will appear with the Start node.

  Note: The Start node is the starting point of any PHLO. It lets you trigger a PHLO to start upon one of three actions: incoming SMS message, incoming, or API request.

• From the list of components on the left-hand side, drag and drop the Send Message component onto the canvas. When a component is placed on the canvas it becomes a node.

• Draw a line to connect the Start node’s API Request trigger state to the Send Message node.

• In the Configuration pane at the right of the canvas, configure the Send Message node with a sender ID in the From field. Enter the destination number you wish to send a message to in the To field. Put your message in the Text field.

  Note: You can define a static payload by specifying values when you create the PHLO, or define a dynamic payload by passing values through Liquid templating parameters when you trigger the PHLO from your application.

• If you’d like to send an MMS message, configure the Media URLs field with the media files you’d like to send.

• Once you’ve configured the node, click Validate to save the configuration.

• After you complete the configuration, give the PHLO a name by clicking in the upper left, then click Save.

Your PHLO is now ready to test.

​

Trigger the PHLO

You integrate a PHLO into your application workflow by making an API request to trigger the PHLO with the required payload — the set of parameters you pass to the PHLO. You can define a static payload by specifying values when you create the PHLO, or define a dynamic payload by passing values through parameters when you trigger the PHLO from your application.

In either case, you need your Auth ID and Auth Token, which you can get from the overview page of the Plivo console.

You also need the PHLO ID, which you can copy from the PHLO list page.

​

With a static payload

When you configure values when creating the PHLO, they act as a static payload.

​

Code

In Visual Studio, in the CS project, edit Program.cs and paste into it this code.

using System;
using Plivo;

namespace test_PHLO
{
    class Program
    {
        public static void Main(string[] args)
        {
            var phloClient = new PhloApi("<auth_id>", "<auth_token>"); 
            var phloID = "<phlo_id>";
            var phlo = phloClient.Phlo.Get(phloID);   
            Console.WriteLine(phlo.Run());
        }
    }
}

Replace the auth placeholders with your authentication credentials from the Plivo console. Replace the phlo_id placeholder with your PHLO ID from the Plivo console.

​

With a dynamic payload

To use dynamic values for the parameters, use Liquid templating parameters when you create the PHLO …

… and pass the values from your code when you trigger it.

​

Code

In Visual Studio, in the CS project, open the file Program.cs and paste into it this code.

using System;
using System.Collections.Generic;
using Plivo;

namespace test_PHLO
{
    class Program
    {
        public static void Main(string[] args)
        {
            var phloClient = new PhloApi("<auth_id>", "<auth_token>");
            var phloID = "<phlo_id>";
            var phlo = phloClient.Phlo.Get(phloID); 
            var data = new Dictionary<string, object>
            {
                { "From", "<sender_id>" },
                { "To", "<destination_number>" }

            };  
            Console.WriteLine(phlo.Run(data));
        }
    }
}

Replace the auth placeholders with your authentication credentials from the Plivo console. Replace the phlo_id placeholder with your PHLO ID from the Plivo console. Replace the phone number placeholders with actual phone numbers in E.164 format (for example, +12025551234).

​

Test

Save the file and run it.

$ dotnet run

​

Receive your first inbound SMS/MMS message

You can create and deploy a PHLO to receive an SMS text message with a few clicks on the PHLO canvas.

​

Prerequisite

To receive incoming text messages, you must have an SMS-enabled Plivo phone number. You can rent numbers from the Numbers page of the Plivo console, or by using the Numbers API.

​

Create the PHLO

To create a PHLO, visit the PHLO page of the Plivo console. If this is your first PHLO, the PHLO page will be empty.

• Click Create New PHLO.

• In the Choose your use case pop-up, click Build my own. The PHLO canvas will appear with the Start node.

  Note: The Start node is the starting point of any PHLO. It lets you trigger a PHLO to start upon one of three actions: incoming SMS message, incoming call, or API request.

• From the list of components on the left-hand side, drag and drop the HTTP Request component onto the canvas. When a component is placed on the canvas it becomes a node.

• Draw a line to connect the Start node’s Incoming Message trigger state to the HTTP Request node.

• In the Configuration pane at the right of the canvas, configure the HTTP Request node. Specify the address of your web server and specify that from, to, and text fields should be passed along with the request.

• Once you’ve configured the node, click Validate to save the configuration.

• After you complete the configuration, give the PHLO a name by clicking in the upper left, then click Save.

​

Assign the PHLO to a Plivo number

Once you’ve created and configured your PHLO, assign it to a Plivo number.

• On the Numbers page of the console, under Your Numbers, click the phone number you want to use for the PHLO.

• In the Number Configuration box, select PHLO from the Application Type drop-down.

• From the PHLO Name drop-down, select the PHLO you want to use with the number, then click Update Number.

​

Test

You can now send a text message to your Plivo phone number and see how the inbound text is handled.

For more information about creating a PHLO application, see the PHLO Getting Started guide. For information on components and their variables, see the PHLO Components Library.

​

Forward an incoming SMS/MMS message

You can create and deploy a PHLO to forward an incoming message with a few clicks on the PHLO canvas.

​

Prerequisite

To receive incoming text messages, you must have an SMS-enabled Plivo phone number. You can rent numbers from the Numbers page of the Plivo console, or by using the Numbers API.

​

Create the PHLO

To create a PHLO, visit the PHLO page of the Plivo console. If this is your first PHLO, the PHLO page will be empty.

• Click Create New PHLO.

• In the Choose your use case pop-up, click Build my own. The PHLO canvas will appear with the Start node.

  Note: The Start node is the starting point of any PHLO. It lets you trigger a PHLO to start upon one of three actions: incoming SMS message, incoming call, or API request.

• From the list of components on the left-hand side, drag and drop the Send Message component onto the canvas. When a component is placed on the canvas it becomes a node.

• Draw a line to connect the Start node’s Incoming Message trigger state to the Send Message node.

• In the Configuration pane at the right of the canvas, configure the Send Message node with the phone number to which you want to forward the message.

• Once you’ve configured the node, click Validate to save the configuration.

• After you complete the configuration, give the PHLO a name by clicking in the upper left, then click Save.

​

Assign the PHLO to a Plivo number

Once you’ve created and configured your PHLO, assign it to a Plivo number.

• On the Numbers page of the console, under Your Numbers, click the phone number you want to use for the PHLO.

• In the Number Configuration box, select PHLO from the Application Type drop-down.

• From the PHLO Name drop-down, select the PHLO you want to use with the number, then click Update Number.

​

Test

You can now send a text message to your Plivo phone number and see how the inbound text is forwarded.

For more information about creating a PHLO application, see the PHLO Getting Started guide. For information on components and their variables, see the PHLO Components Library.

​

More use cases

We illustrate more than a dozen use cases with code for both PHLO and API/XML on our documentation pages.

​

Install .NET Core and the Plivo .NET SDK

You must set up and install .NET Core and Plivo’s .NET SDK before you send your first SMS message.

​

Install .NET Core

You can check whether you already have .NET Core installed under macOS or Linux and what version is installed by running the command dotnet --version in a terminal window. Under Windows there are several ways to check. If you don’t have it or need a more current version, download and install it.

​

Install the Plivo .NET SDK

Create a projects directory and change into it.

$ mkdir mydotnetcoreapps
$ cd mydotnetcoreapps

Install the Plivo SDK using the .NET CLI.

$ dotnet new console
$ dotnet add package Plivo

Once you’ve set up your development environment, you can start sending and receiving messages using our APIs and XML documents. Here are three common use cases to get you started.

​

Send your first outbound SMS/MMS message

You must have a Plivo phone number to send messages to the US or Canada; you can buy a Plivo number from Phone Numbers > Buy Numbers on the Plivo console or via the Numbers API.

​

Code

Open the file in the CS project called Program.cs and paste into it this code.

using System;
using System.Collections.Generic;
using Plivo;

namespace testplivo
{
    internal class Program
    {
        public static void Main(string[] args)
        {
            var api = new PlivoApi("<auth_id>","<auth_token>");
            var response = api.Message.Create(
                src: "<sender_id>",
                dst: new List<String> { "<destination_number>" },
                text: "Hello, from .NET Core!"
                );
            Console.WriteLine(response);
        }
    }
}

using System;
using System.Collections.Generic;
using Plivo;

namespace testplivo
{
    internal class Program
    {
        public static void Main(string[] args)
        {
            var api = new PlivoApi("<auth_id>","<auth_token>");
            var response = api.Message.Create(
                src: "<sender_id>",
                dst: new List<String> { "<destination_number>" },
                text: "Hello, from .NET Core!"
                );
            Console.WriteLine(response);
        }
    }
}

using System;
using System.Collections.Generic;
using Plivo;

namespace testplivo
{
    internal class Program
    {
        public static void Main(string[] args)
        {
            var api = new PlivoApi("<auth_id>","<auth_token>");
            var response = api.Message.Create(
                src: "<sender_id>",
                dst: "<destination_number>",
                text: "Hello, MMS from .NET Core!",
                type:"mms",
                media_urls: new string[]{"https://media.giphy.com/media/26gscSULUcfKU7dHq/source.gif"},
                media_ids: new String[]{"801c2056-33ab-499c-80ef-58b574a462a2"}
                );
            Console.WriteLine(response);
        }
    }
}

Replace the auth placeholders with your authentication credentials from the Plivo console. Replace the phone number placeholders with actual phone numbers in E.164 format (for example, +12025551234). In countries other than the US and Canada you can use a sender ID for the message source.

​

Test

Save the file and run it.

    $ dotnet run

​

Receive your first inbound SMS/MMS message

To receive incoming messages, you must have a Plivo phone number that supports SMS; you can rent numbers from the Numbers page of the Plivo console or by using the Numbers API.

​

Create an MVC project

In the .NET Core projects directory, create a new MVC project.

$ dotnet new mvc --no-https

Navigate to the Controllers subdirectory, create a controller named ReceiveSmsController.cs, and paste into it this code.

using System;
using Microsoft.AspNetCore.Mvc;

namespace ReceiveSms.Controllers
{
    public class ReceiveSmsController : Controller
    {
        // GET: /<controller>/
        public String Index()
        {
            String from_number = Request.Form["From"];
            String to_number = Request.Form["To"]; 
            String text = Request.Form["Text"];
            Console.WriteLine("Message received - From: {0}, To: {1}, Text: {2}", from_number, to_number, text);

            return "Message received";
        }
    }
}

using System;
using Microsoft.AspNetCore.Mvc;

namespace ReceiveSms.Controllers
{
    public class ReceiveSmsController : Controller
    {
        // GET: /<controller>/
        public String Index()
        {
            String from_number = Request.Form["From"];
            String to_number = Request.Form["To"]; 
            String text = Request.Form["Text"];
            Console.WriteLine("Message received - From: {0}, To: {1}, Text: {2}", from_number, to_number, text);

            return "Message received";
        }
    }
}

using System;
using Microsoft.AspNetCore.Mvc;

namespace ReceiveSms.Controllers
{
    public class ReceiveSmsController : Controller
    {
        // GET: /<controller>/
        public String Index()
        {
            String from_number = Request.Form["From"]; 
            String to_number = Request.Form["To"];
            String text = Request.Form["Text"];
            String media_url = Request.Form["Media0"];
            Console.WriteLine("Message received - From: {0}, To: {1}, Text: {2}, Media:{3}", from_number, to_number, text, media_url);

            return "Message received";
        }
    }
}

Before you start the application, edit Properties/launchSettings.json and set applicationUrl.

    "applicationUrl": "http://localhost:5000/"

Start the local server.

$ dotnet run

You should see your basic server application in action at http://localhost:5000/receivesms/.

​

Expose your local server to the internet

To receive incoming messages, your local server must connect with Plivo API services. For that, we recommend using ngrok, which exposes local servers running behind NATs and firewalls to the public internet over secure tunnels. Using ngrok, you can set webhooks that can talk to the Plivo server.

Install ngrok and run it on the command line, specifying the port that hosts the application on which you want to receive messages (5000 in this case):

./ngrok http 5000

This starts the ngrok server on your local server. Ngrok will display a forwarding link that you can use as a webhook to access your local server over the public network.

Now people can send messages to your Plivo number.

​

Create a Plivo application to receive messages

Associate the controller you created with Plivo by creating a Plivo application. Visit Messaging > Applications and click Add New Application. You can also use Plivo’s Application API.

Give your application a name — we called ours Receive SMS. Enter the server URL you want to use (for example https://<yourdomain>.com/receive_sms/) in the Message URL field and set the method to POST. Click Create Application to save your application.

​

Assign a Plivo number to your application

Navigate to the Numbers page and select the phone number you want to use for this application.

From the Application Type drop-down, select XML Application.

From the Plivo Application drop-down, select Receive SMS (the name we gave the application).

Click Update Number to save.

​

Test

Send a text message to the Plivo number you specified using any phone.

​

Reply to an incoming SMS/MMS message

To receive incoming messages, you must have a Plivo phone number that supports SMS; you can rent numbers from the Numbers page of the Plivo console or by using the Numbers API.

​

Create a .NET controller

Create a controller called ReplytoInboundController.cs in the Controllers directory and paste into it this code.

using System;
using System.Collections.Generic;
using Microsoft.AspNetCore.Mvc;

namespace ReceiveSms.Controllers
{
    public class ReplytoInboundController : Controller
    {
        // GET: /<controller>/
        public IActionResult Index()
        {
            String from_number = Request.Form["From"];
            String to_number = Request.Form["To"];
            String text = Request.Form["Text"];
			  Plivo.XML.Response resp = new Plivo.XML.Response();
			  resp.AddMessage("This is an automatic response",
							new Dictionary<string, string>()
			{
				{"src", to_number},
				{"dst", from_number},
				{"type", "sms"}
			});
			var output = resp.ToString();
			Console.WriteLine(output);
			return this.Content(output, "text/xml");
		}
    }
}

If you haven’t done so already, expose your local server to the internet.

​

Create a Plivo application to reply to messages

Associate the controller you created with Plivo by creating a Plivo application. Visiting Messaging > Applications and click Add New Application. You can also use Plivo’s Application API.

Give your application a name — we called ours Reply Incoming SMS. Enter the server URL you want to use (for example http://<yourdomain>.com/replysms/) in the Message URL field and set the method to POST. Click Create Application to save your application.

​

Assign a Plivo number to your application

Navigate to the Numbers page and select the phone number you want to use for this application.

From the Application Type drop-down, select XML Application.

From the Plivo Application drop-down, select Reply Incoming SMS (the name we gave the application).

Click Update Number to save.

​

Test

Start the local server.

    $ dotnet run

Send a text message to the Plivo number you specified using any phone. You should receive a reply.

​

More use cases

We illustrate more than a dozen use cases with code for both API/XML and PHLO on our documentation pages.

​

Set up your .NET Framework dev environment

You must set up and install .NET Framework 4.6 or higher and Plivo’s .NET SDK before you send your first message.

You can check whether you already have .NET Framework installed under macOS or Linux and what version is installed by running the command dotnet --version in a terminal window. Under Windows there are several ways to check. If you don’t have it or need a more current version, download and install it.

​

Install the Plivo .NET SDK using Visual Studio

Create a new project in Visual Studio.

Choose Console Application as the template for the new project.

Install the Plivo NuGet package.

Once you’ve set up your development environment, you can start sending and receiving messages using PHLO, our visual workflow design studio, or using our APIs and XML documents. Here are three common use cases to get you started.

​

Send your first outbound SMS/MMS message

You can create and deploy a PHLO to send an outbound text message with a few clicks on the PHLO canvas, and trigger it with some simple code.

​

Create the PHLO

To create a PHLO, visit the PHLO page of the Plivo console. If this is your first PHLO, the PHLO page will be empty.

• Click Create New PHLO.

• In the Choose your use case pop-up, click Build my own. The PHLO canvas will appear with the Start node.

  Note: The Start node is the starting point of any PHLO. It lets you trigger a PHLO to start upon one of three actions: incoming SMS message, incoming, or API request.

• From the list of components on the left-hand side, drag and drop the Send Message component onto the canvas. When a component is placed on the canvas it becomes a node.

• Draw a line to connect the Start node’s API Request trigger state to the Send Message node.

• In the Configuration pane at the right of the canvas, configure the Send Message node with a sender ID in the From field. Enter the destination number you wish to send a message to in the To field. Put your message in the Text field.

  Note: You can define a static payload by specifying values when you create the PHLO, or define a dynamic payload by passing values through Liquid templating parameters when you trigger the PHLO from your application.

• If you’d like to send an MMS message, configure the Media URLs field with the media files you’d like to send.

• Once you’ve configured the node, click Validate to save the configuration.

• After you complete the configuration, give the PHLO a name by clicking in the upper left, then click Save.

Your PHLO is now ready to test.

​

Trigger the PHLO

You integrate a PHLO into your application workflow by making an API request to trigger the PHLO with the required payload — the set of parameters you pass to the PHLO. You can define a static payload by specifying values when you create the PHLO, or define a dynamic payload by passing values through parameters when you trigger the PHLO from your application.

In either case, you need your Auth ID and Auth Token, which you can get from the overview page of the Plivo console.

You also need the PHLO ID, which you can copy from the PHLO list page.

​

With a static payload

When you configure values when creating the PHLO, they act as a static payload.

​

Code

In Visual Studio, in the CS project, edit the file Program.cs and paste into it this code.

using System;
using Plivo;

namespace test_PHLO
{
    class Program
    {
        public static void Main(string[] args)
        {
            var phloClient = new PhloApi("<auth_id>", "<auth_token>"); 
            var phloID = "<phlo_id>";
            var phlo = phloClient.Phlo.Get(phloID);   
            Console.WriteLine(phlo.Run());
        }
    }
}

Replace the auth placeholders with your authentication credentials from the Plivo console. Replace the phlo_id placeholder with your PHLO ID from the Plivo console.

​

With a dynamic payload

To use dynamic values for the parameters, use Liquid templating parameters when you create the PHLO …

… and pass the values from your code when you trigger it.

​

Code

In Visual Studio, in the CS project, open the file Program.cs and paste into it this code.

using System;
using System.Collections.Generic;
using Plivo;

namespace test_PHLO
{
    class Program
    {
        public static void Main(string[] args)
        {
            var phloClient = new PhloApi("<auth_id>", "<auth_token>");
            var phloID = "<phlo_id>";
            var phlo = phloClient.Phlo.Get(phloID); 
            var data = new Dictionary<string, object>
            {
                { "From", "<sender_id>" },
                { "To", "<destination_number>" }

            };  
            Console.WriteLine(phlo.Run(data));
        }
    }
}

Replace the auth placeholders with your authentication credentials from the Plivo console. Replace the phlo_id placeholder with your PHLO ID from the Plivo console. Replace the phone number placeholders with actual phone numbers in E.164 format (for example, +12025551234).

​

Test

Save the file and run the code from the Visual Studio IDE.

​

Receive your first inbound SMS/MMS message

You can create and deploy a PHLO to receive an inbound text message with a few clicks on the PHLO canvas, without writing a single line of code.

​

Prerequisite

To receive incoming text messages, you must have an SMS-enabled Plivo phone number. You can rent numbers from the Numbers page of the Plivo console, or by using the Numbers API.

​

Create the PHLO

To create a PHLO, visit the PHLO page of the Plivo console. If this is your first PHLO, the PHLO page will be empty.

• Click Create New PHLO.

• In the Choose your use case pop-up, click Build my own. The PHLO canvas will appear with the Start node.

  Note: The Start node is the starting point of any PHLO. It lets you trigger a PHLO to start upon one of three actions: incoming SMS message, incoming call, or API request.

• From the list of components on the left-hand side, drag and drop the HTTP Request component onto the canvas. When a component is placed on the canvas it becomes a node.

• Draw a line to connect the Start node’s Incoming Message trigger state to the HTTP Request node.

• In the Configuration pane at the right of the canvas, configure the HTTP Request node. Specify the address of your web server and specify that from, to, and text fields should be passed along with the request.

• Once you’ve configured the node, click Validate to save the configuration.

• After you complete the configuration, give the PHLO a name by clicking in the upper left, then click Save.

​

Assign the PHLO to a Plivo number

Once you’ve created and configured your PHLO, assign it to a Plivo number.

• On the Numbers page of the console, under Your Numbers, click the phone number you want to use for the PHLO.

• In the Number Configuration box, select PHLO from the Application Type drop-down.

• From the PHLO Name drop-down, select the PHLO you want to use with the number, then click Update Number.

​

Test

You can now send a text message to your Plivo phone number and see how the inbound text is handled.

For more information about creating a PHLO application, see the PHLO Getting Started guide. For information on components and their variables, see the PHLO Components Library.

​

Forward an incoming SMS/MMS message

You can create and deploy a workflow to implement text message forwarding with a few clicks on the PHLO canvas.

​

Prerequisite

To receive incoming text messages, you must have an SMS-enabled Plivo phone number. You can rent numbers from the Numbers page of the Plivo console, or by using the Numbers API.

​

Create the PHLO

To create a PHLO, visit the PHLO page of the Plivo console. If this is your first PHLO, the PHLO page will be empty.

• Click Create New PHLO.

• In the Choose your use case pop-up, click Build my own. The PHLO canvas will appear with the Start node.

  Note: The Start node is the starting point of any PHLO. It lets you trigger a PHLO to start upon one of three actions: incoming SMS message, incoming call, or API request.

• From the list of components on the left-hand side, drag and drop the Send Message component onto the canvas. When a component is placed on the canvas it becomes a node.

• Draw a line to connect the Start node’s Incoming Message trigger state to the Send Message node.

• In the Configuration pane at the right of the canvas, configure the Send Message node with the phone number to which you want to forward the message.

• Once you’ve configured the node, click Validate to save the configuration.

• After you complete the configuration, give the PHLO a name by clicking in the upper left, then click Save.

​

Assign the PHLO to a Plivo number

Once you’ve created and configured your PHLO, assign it to a Plivo number.

• On the Numbers page of the console, under Your Numbers, click the phone number you want to use for the PHLO.

• In the Number Configuration box, select PHLO from the Application Type drop-down.

• From the PHLO Name drop-down, select the PHLO you want to use with the phone number, then click Update Number.

​

Test

You can now send a text message to your Plivo phone number and see how the inbound text is forwarded.

For more information about creating a PHLO application, see the PHLO Getting Started guide. For information on components and their variables, see the PHLO Components Library.

​

More use cases

We illustrate more than a dozen use cases with code for both PHLO and API/XML on our documentation pages.

​

Install .NET Framework and the Plivo .NET SDK

You must set up and install .NET Framework 4.6 or higher and Plivo’s .NET SDK before you send your first SMS message.

​

Install .NET Framework

You can check whether you already have .NET Framework installed under macOS or Linux and what version is installed by running the command dotnet --version in a terminal window. Under Windows there are several ways to check. If you don’t have it or need a more current version, download and install it.

​

Install the Plivo .NET SDK using Visual Studio

Create a new project in Visual Studio.

Choose a template for the new project.

Install the Plivo NuGet package.

Once you’ve set up your development environment, you can start sending and receiving messages using our APIs and XML documents. Here are three common use cases to get you started.

​

Send your first outbound SMS/MMS message

You must have a Plivo phone number to send messages to the US or Canada; you can rent a Plivo number from Phone Numbers > Buy Numbers on the Plivo console or via the Numbers API.

Open the file in the CS project called Program.cs and paste into it this code.

​

Code

using System;
using System.Collections.Generic;
using Plivo;

namespace testplivo
{
    internal class Program
    {
        public static void Main(string[] args)
        {
            var api = new PlivoApi("<auth_id>","<auth_token>");
            var response = api.Message.Create(
                src: "<sender_id>",
                dst: new List<String> { "<destination_number>" },
                text: "Hello, from .NET Framework!"
                );
            Console.WriteLine(response);
        }
    }
}

using System;
using System.Collections.Generic;
using Plivo;

namespace testplivo
{
    internal class Program
    {
        public static void Main(string[] args)
        {
            var api = new PlivoApi("<auth_id>","<auth_token>");
            var response = api.Message.Create(
                src: "<sender_id>",
                dst: new List<String> { "<destination_number>" },
                text: "Hello, from .NET Framework!"
                );
            Console.WriteLine(response);
        }
    }
}

using System;
using System.Collections.Generic;
using Plivo;

namespace testplivo
{
    internal class Program
    {
        public static void Main(string[] args)
        {
            var api = new PlivoApi("<auth_id>","<auth_token>");
            var response = api.Message.Create(
                src: "<sender_id>",
                dst: "<destination_number>",
                text: "Hello, from .NET Framework!",
                type:"mms",
                media_urls: new string[]{"https://media.giphy.com/media/26gscSULUcfKU7dHq/source.gif"},
                media_ids: new String[]{"801c2056-33ab-499c-80ef-58b574a462a2"}
                );
            Console.WriteLine(response);
        }
    }
}

Replace the auth placeholders with your authentication credentials from the Plivo console. Replace the phone number placeholders with actual phone numbers in E.164 format (for example, +12025551234). In countries other than the US and Canada you can use a sender ID for the message source.