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This library allows you to quickly and easily use the SendGrid Web API v3 via C# with .NET.

Version 9.X.X+ of this library provides full support for all SendGrid Web API v3 endpoints, including the new v3 /mail/send.

We want this library to be community driven, and SendGrid led. We need your help to realize this goal. To help make sure we are building the right things in the right order, we ask that you create issues and pull requests or simply upvote or comment on existing issues or pull requests.

For updates to this library, see our CHANGELOG and releases.

Subscribe to email release notifications to receive emails about releases and breaking changes.

We appreciate your continued support, thank you!

• Installation
• Quick Start
• Usage
• Use Cases
• Announcements
• Roadmap
• How to Contribute
• Troubleshooting
• About
• License

• .NET version 4.5.2 and higher
• .NET Core 1.0 and higher
• .NET Standard 1.3 support
• A SendGrid account, sign up for free to send up to 40,000 emails for the first 30 days or check out our pricing.

Grab your API Key from the SendGrid UI.

Manage your SendGrid API Keys by storing them in Environment Variables or in Web.config. It is a good practice to keep your data and configuration settings separate. This way to you can change your SendGrid API key without changing your code. Also, we strongly advise against storing sensitive data directly in your code.

Setup Environment Variables using the UI:

1. Press Win+R and run SystemPropertiesAdvanced
2. Click on Environment Variables
3. Click New in user variables section
4. Type SENDGRID_API_KEY in the name. (Make sure this name matches the name of key in your code)
5. Type actual API Key in the value
6. Restart the IDE and you're done!

Setup Environment Variables using CMD:

1. Run CMD as administrator
2. setx SENDGRID_API_KEY "YOUR_API_KEY"

Here are few example to get and set API Keys programatically:

Get Environment Variable

var apiKey = Environment.GetEnvironmentVariable("SENDGRID_API_KEY");

Set Environment Variable

var setKey = Environment.SetEnvironmentVariable("SENDGRID_API_KEY", "YOUR_API_KEY");

To use SendGrid in your C# project, you can either download the SendGrid C# .NET libraries directly from our Github repository or if you have the NuGet package manager installed, you can grab them automatically:

PM> Install-Package SendGrid

Once you have the SendGrid library installed, you can include calls to them in your code. For sample implementations, see the .NET Core Example and the .NET 4.5.2 Example folders.

• Please see the .nuspec file.

The following is the minimum needed code to send an simple email. Use this example, and modify the apiKey, from and to variables:

using SendGrid;
using SendGrid.Helpers.Mail;
using System;
using System.Threading.Tasks;

namespace Example
{
    internal class Example
    {
        private static void Main()
        {
            Execute().Wait();
        }

        static async Task Execute()
        {
            var apiKey = Environment.GetEnvironmentVariable("NAME_OF_THE_ENVIRONMENT_VARIABLE_FOR_YOUR_SENDGRID_KEY");
            var client = new SendGridClient(apiKey);
            var from = new EmailAddress("[email protected]", "Example User");
            var subject = "Sending with SendGrid is Fun";
            var to = new EmailAddress("[email protected]", "Example User");
            var plainTextContent = "and easy to do anywhere, even with C#";
            var htmlContent = "<strong>and easy to do anywhere, even with C#</strong>";
            var msg = MailHelper.CreateSingleEmail(from, to, subject, plainTextContent, htmlContent);
            var response = await client.SendEmailAsync(msg);
        }
    }
}

After executing the above code, response.StatusCode should be 202 and you should have an email in the inbox of the to recipient. You can check the status of your email in the UI. Alternatively, we can post events to a URL of your choice using our Event Webhook. This gives you data about the events that occur as SendGrid processes your email.

For more advanced cases, you can build the SendGridMessage object yourself with these minimum required settings:

using SendGrid;
using SendGrid.Helpers.Mail;
using System;
using System.Threading.Tasks;

namespace Example
{
    internal class Example
    {
        private static void Main()
        {
            Execute().Wait();
        }

	    static async Task Execute()
        {
            var apiKey = Environment.GetEnvironmentVariable("NAME_OF_THE_ENVIRONMENT_VARIABLE_FOR_YOUR_SENDGRID_KEY");
            var client = new SendGridClient(apiKey);
            var msg = new SendGridMessage()
            {
                From = new EmailAddress("[email protected]", "DX Team"),
                Subject = "Sending with SendGrid is Fun",
                PlainTextContent = "and easy to do anywhere, even with C#",
                HtmlContent = "<strong>and easy to do anywhere, even with C#</strong>"
            };
            msg.AddTo(new EmailAddress("[email protected]", "Test User"));
            var response = await client.SendEmailAsync(msg);
        }
    }
}

You can find an example of all of the email features here.

using System;
using System.Threading.Tasks;
using SendGrid;

namespace Example
{
    internal class Example
    {
        private static void Main()
        {
            Execute().Wait();
        }

        static async Task Execute()
        {
            var apiKey = Environment.GetEnvironmentVariable("NAME_OF_THE_ENVIRONMENT_VARIABLE_FOR_YOUR_SENDGRID_KEY");
            var client = new SendGridClient(apiKey);
            var queryParams = @"{
                'limit': 100
            }";
            var response = await client.RequestAsync(method: SendGridClient.Method.GET,
                                                     urlPath: "suppression/bounces",
                                                     queryParams: queryParams);
	    }
    }
}

var apiKey = Environment.GetEnvironmentVariable("NAME_OF_THE_ENVIRONMENT_VARIABLE_FOR_YOUR_SENDGRID_KEY");
var proxy = new WebProxy("http://proxy:1337");
var client = new SendGridClient(proxy, apiKey);

• SendGrid Docs
• Library Usage Docs
• Example Code - .NET Core
• Example Code - .NET 4.5.2+
• How-to: Migration from v2 to v3
• v3 Web API Mail Send Helper

Here are some examples of common API use cases, such as how to send an email with a transactional template.

If you are interested in the future direction of this project, please take a look at our open issues and pull requests. We would love to hear your feedback!

We encourage contribution to our library (you might even score some nifty swag), please see our CONTRIBUTING guide for details.

Quick links:

• Feature Request
• Bug Reports
• Sign the CLA to Create a Pull Request
• Improvements to the Codebase
• Review Pull Requests

Please see our troubleshooting guide for common library issues.

sendgrid-csharp is guided and supported by the SendGrid Developer Experience Team.

sendgrid-csharp is maintained and funded by SendGrid, Inc. The names and logos for sendgrid-csharp are trademarks of SendGrid, Inc.

The MIT License (MIT)