[HttpPost]
[Authorize]
[ValidateAntiForgeryToken]
public async Task<ActionResult> Create([Bind(Include = "Url, Homepage, Language, Country, Name")]FeedModel feedModel)
    {
        feedModel.Id = Guid.NewGuid().ToString();
        feedModel.UserId = User.Identity.GetUserId();

        Debug.WriteLine(feedModel.UserId);

        if (ModelState.IsValid)
        {
            db.Feeds.Add(feedModel);
            await db.SaveChangesAsync();
            return RedirectToAction("Index");
        }

        return View(feedModel);
    }

public class FeedModel
{
    [Key]
    public string Id { get; set; }
    [Required]
    public string UserId { get; set; }
    [Required]
    public string Url { get; set; }
    [Required]
    public string Homepage { get; set; }
    [Required]
    public string Language { get; set; }
    [Required]
    public string Country { get; set; }
    [Required]
    public string Name { get; set; }
}