Example BackgroundService with C# ASP.Net Core

EmailQueueHostedService.cs

using Microsoft.EntityFrameworkCore;

namespace Joy.HostedServices;

public class EmailQueueHostedService : BackgroundService
{
    private IServiceScopeFactory ScopeFactory { get; init; }

    public EmailQueueHostedService(IServiceScopeFactory scopeFactory)
    {
        ScopeFactory = scopeFactory;
    }

    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        using PeriodicTimer periodicTimer = new(TimeSpan.FromSeconds(30));

        try
        {
            while (await periodicTimer.WaitForNextTickAsync(stoppingToken))
            {
                using IServiceScope scope = ScopeFactory.CreateScope();

                try
                {
                    DbContext DbContext = scope.ServiceProvider.GetRequiredService<DbContext>();

                    IConfiguration configuration = scope.ServiceProvider.GetRequiredService<IConfiguration>();

                    List<EmailQueueItemEntity> emailQueueitems = await etbDbContext.EmailQueueItems
                        .Where(v => v.IsSent == false)
                        .OrderBy(v => v.Created)
                        .Take(5)
                        .ToListAsync();

                    foreach (EmailQueueItemEntity emailQueueItem in emailQueueitems)
                    {
                        // ...
                        
                        await client.SendAsync(message);

                        emailQueueItem.IsSent = true;

                        await etbDbContext.SaveChangesAsync();
                    }
                }
                catch (Exception ex)
                {
                    Log.Error(ex, "Issue Sending Email");
                }
            }
        }
        catch (Exception ex)
        {
            Log.Error(ex, "Issue Running PeriodicTimer");
        }
    }
}