v2 API C# Code Example

We recommend using SendGrid C#, our client library, available on GitHub, with full documentation.

The library does not officially support the V2 API, but you can use V2 with an older version of the library. For more information, see Continue Using V2 in C#.

Using SendGrid's C# Library

// using SendGrid's C# Library - https://github.com/sendgrid/sendgrid-csharp
using System.Net.Http;
using System.Net.Mail;

var myMessage = new SendGrid.SendGridMessage();
myMessage.AddTo("test@sendgrid.com");
myMessage.From = new EmailAddress("you@youremail.com", "First Last");
myMessage.Subject = "Sending with SendGrid is Fun";
myMessage.PlainTextContent= "and easy to do anywhere, even with C#";

var transportWeb = new SendGrid.Web("SENDGRID_APIKEY");
transportWeb.DeliverAsync(myMessage);
// NOTE: If you're developing a Console Application,
// use the following so that the API call has time to complete
// transportWeb.DeliverAsync(myMessage).Wait();

Using .NET's Built-in SMTP Library

If you choose not to use SendGrid's client library you may use .NET's built in library.

If you are using ASP.NET, you can specify SMTP settings in web.config. Please note that your username should be "apikey" as specified in "Integrating with the SMTP API". Your password will be your SendGrid API key. For more information about SendGrid API keys, see our API Key documentation. We also have a Twilio blog post to help you learn "How to Set Environment Variables".

<system.net>
  <mailSettings>
    <smtp from="test@domain.com">
      <network host="smtp.sendgrid.net" password="<your_api_key>" userName="apikey" port="587" />
    </smtp>
  </mailSettings>
</system.net>

This C# program will build a MIME email and send it through SendGrid. .NET already has built in libraries to send and receive emails. This example uses: .NET Mail

using System;
using System.Net;
using System.Net.Mail;
using System.Net.Mime;

namespace SmtpMail
{
  internal class Program
  {
    static void Main(string[] args)
    {
      using (MailMessage mailMsg = new MailMessage())
      {
        // API key
        string apiKey = Environment.GetEnvironmentVariable("SENDGRID_API_KEY");

        // To
        mailMsg.To.Add(new MailAddress("to@example.com", "To Name"));

        // From
        mailMsg.From = new MailAddress("from@example.com", "From Name");

        // Subject and multipart/alternative Body
        mailMsg.Subject = "subject";
        string text = "text body";
        string html = @"<p>html body</p>";
        mailMsg.AlternateViews.Add(AlternateView.CreateAlternateViewFromString(text, null, MediaTypeNames.Text.Plain));
        mailMsg.AlternateViews.Add(AlternateView.CreateAlternateViewFromString(html, null, MediaTypeNames.Text.Html));

        // Init SmtpClient and send
        using (SmtpClient smtpClient = new SmtpClient("smtp.sendgrid.net", 587))
        {
          smtpClient.Credentials = new NetworkCredential("apikey", apiKey);
          smtpClient.Send(mailMsg);
        }
      }
    }
  }
}
Rate this page:

Need some help?

We all do sometimes. Get help now from the Twilio SendGrid Support Team.

Running into a coding hurdle? Lean on the wisdom of the crowd by browsing the SendGrid tag on Stack Overflow or visiting Twilio's Stack Overflow Collective.

Thank you for your feedback!

Please select the reason(s) for your feedback. The additional information you provide helps us improve our documentation:

Sending your feedback...
🎉 Thank you for your feedback!
Something went wrong. Please try again.

Thanks for your feedback!

Refer us and get $10 in 3 simple steps!

Step 1

Get link

Get a free personal referral link here

Step 2

Give $10

Your user signs up and upgrade using link

Step 3

Get $10

1,250 free SMSes
OR 1,000 free voice mins
OR 12,000 chats
OR more