What is Azure Functions and How to Use Tutorial

				
					#r "SendGrid"

using System;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using SendGrid.Helpers.Mail;

namespace BirthdayFunction
{
    public static class SendBirthdayMessage
    {
        [FunctionName("SendBirthdayMessage")]
        public static async Task Run(
            [HttpTrigger(AuthorizationLevel.Function, "post", Route = null)] HttpRequest req,
            ILogger log)
        {
            log.LogInformation("Sending birthday message.");

            // Retrieve the email address and name of the customer from the request body
            string email = req.Form["email"];
            string name = req.Form["name"];

            // Set the SendGrid API key
            string apiKey = Environment.GetEnvironmentVariable("SENDGRID_API_KEY");
            var client = new SendGridClient(apiKey);

            // Construct the email message
            var from = new EmailAddress("hello@example.com", "Birthday Bot");
            var subject = "Happy Birthday!";
            var to = new EmailAddress(email, name);
            var htmlContent = $"<p>Happy birthday, {name}!</p>";
            var msg = MailHelper.CreateSingleEmail(from, to, subject, "", htmlContent);

            // Send the email
            await client.SendEmailAsync(msg);

            return new OkObjectResult("Birthday message sent.");
        }
    }
}