Question 1

How to send an email with an attachment using SendGrid C#?

Accepted Answer

Use the AddAttachment method on the SendGridMessage object, providing the file content as a base64 string or stream, along with the filename and MIME type. Refer to the library's usage docs or integration tests for detailed examples, as hinted in the README's example code link.

Question 2

SendGrid C# vs FluentEmail: which one should I use?

Accepted Answer

SendGrid C# is the official library best for dedicated SendGrid integration with full API support, while FluentEmail is a multi-provider abstraction offering more flexibility. Choose SendGrid C# if you're committed to SendGrid; otherwise, FluentEmail allows easier switching between email services.

Question 3

How to configure SendGrid with dependency injection in .NET Core?

Accepted Answer

Install the SendGrid.Extensions.DependencyInjection package, then in ConfigureServices, call services.AddSendGrid with options to set the API key. This registers ISendGridClient for injection, as demonstrated in the README's dependency injection example.

Question 4

What are common error codes when using SendGrid C# and how to handle them?

Accepted Answer

Common errors include 401 (invalid API key), 429 (rate limiting), and 404 (invalid endpoint). Handle them by checking the response status code, implementing retry logic for rate limits, and ensuring correct API key setup as per the troubleshooting guide.

Question 5

Can SendGrid C# be used for SMS messaging, and how?

Accepted Answer

Yes, it supports SMS via Twilio SendGrid's API. Use the general v3 web API methods to call SMS endpoints, as mentioned in the announcements and use cases, typically by making HTTP requests to relevant paths with the client.

Question 6

How to send bulk emails efficiently with SendGrid C#?

Accepted Answer

Leverage SendGrid's batch sending features by using the mail/send endpoint with multiple recipients or templates. The library's helpers can construct complex messages, but optimize by reusing client instances and handling async calls properly to avoid bottlenecks.

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