marcfabregatb

  public async Task<IActionResult> Edit(string id)
  {
     if (string.IsNullOrWhiteSpace(id))
     {
        return NotFound();
     }

     var blogEntry = await _context.BlogEntries.Include(x => x.Categories).FirstOrDefaultAsync(x => x.Id == id);
     
     if (blogEntry == null)

marcfabregatb

   public class BlogEntry
   {
      [Key]
      public string Id { get; set; }
      [Required]
      [MaxLength(200)]
      public string Title { get; set; }
      [Required]
      public string Text { get; set; }