Send an SMS Message with .NET Core

Note:

Before you can get started, you need the following already set up:

Set all SMS API configuration settings.
.Net Core 3.1 SDK and a familiarity with how to create a new app.

Learn how to quickly send SMS messages in a .Net Core application with the Sinch API.

Steps:

Set up your .NET Core application
Send your first SMS message

Set up your .Net Core application

Create a new folder where you want your app project. Then, open a terminal or command prompt to that location.
Create a new .Net Core console app with the following command:
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```
dotnet new console
```
Add the Newtonsoft.Json nuget package.
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```
dotnet add package Newtonsoft.Json
```

Modify your application

Open the Program.cs file in your project folder. Replace all of the code in the Main method with the following code:

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SMS sms = new SMS("YOUR_Sinch_virtual_number", new string[] {"recipient_number"} );
sms.sendSMS(sms, "YOUR_servicePlanId", "YOUR_API_token");
Console.ReadLine();

Next, create a new file in the project folder named SMS.cs. Populate that file with the "Send an SMS message" code found on this page.

Send an SMS message

// Find your Service Plan ID and API Token at dashboard.sinch.com/sms/api/rest
// Find your Sinch numbers at dashboard.sinch.com/numbers/your-numbers/numbers
using System;
using System.Net.Http;
using System.Text;
using Newtonsoft.Json;

public class SMS
{
    public string from { get; set; }
    public string[] to { get; set; } 
    public string body { get; set; }
    
    public SMS(string fromVar, string[] toVar)
    {
        from = fromVar;
        to = toVar;
        body = "Hello from Sinch!";
    }

    public async void sendSMS(SMS sms, string servicePlanId, string apiToken)
    {
        using (var client = new HttpClient())
        {
            client.DefaultRequestHeaders.Add("Authorization", "Bearer " + apiToken);
            string json = JsonConvert.SerializeObject(sms);
            var postData = new StringContent(json, Encoding.UTF8, "application/json");
            var request = await client.PostAsync("https://us.sms.api.sinch.com/xms/v1/" + servicePlanId + "/batches", postData);
            var response = await request.Content.ReadAsStringAsync();

            Console.WriteLine(response);
        }
 
    }

}

Save the file.

Fill in your parameters

Back in the Program.cs file, replace the following values for these parameters with your values:

Parameter	Your value
`YOUR_Sinch_virtual_number`	Any number you've assigned to your Sinch account. Find the number on your Sinch dashboard by clicking the service plan ID link and scrolling to the bottom of the page.
`recipient_number`	The phone number to which you want to send the test SMS message.
`YOUR_servicePlanId`	The API token found on your Sinch dashboard. Click `Show` to reveal your API token.
`YOUR_API_token`	The service plan ID found on your Sinch dashboard.

Save the file.

Build your project

Before executing your code, you must first compile your application. Execute the following command:

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dotnet build

Send your first SMS message

Now you can execute the code and send your test SMS message. Run the following command:

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dotnet run

You should receive a text to the phone number you entered and you'll see a response in your terminal or command prompt. Press Enter to exit the application. You did it!

Next steps

The code you used in the SMS.cs file sends a POST request to the Sinch API /batches endpoint to send the SMS message. Click here to read more about the batches endpoint.

Learn how to recieve SMS

Additional resources

Explore the API specification to test more endpoints.