mvc pass user id to table from FormsAuthentication - asp.net-mvc

Question

the problem is when i try to created item give me this error
The INSERT statement conflicted with the FOREIGN KEY constraint
here's my login action
public ActionResult Login(UserTb U, string ReturnUrl)
{
var count = db.UsersTb.Where(x => x.NameUser == U.NameUser && x.PassUser == U.PassUser).Count();
if (count == 0)
{
ViewBag.Msg = "invalde user";
return View();
}
else
{
FormsAuthentication.SetAuthCookie(U.NameUser + "|" + U.IdUser, false);
return RedirectToAction("Index", "Home");
}
}
and i want pass user id to table named items
and user id on this table named Uid so i used this below
[Table("Item")]
public class Item
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int id { get; set; }
[Required]
public string name { get; set; }
public string info { get; set; }
public decimal price { get; set; }
public int? Uid { get; set; }
public int CatId { get; set; }
public int? CountryId { get; set; }
public int? StateId { get; set; }
public int? CityId { get; set; }
[ForeignKey("Uid")]
public virtual UserTb UserTb { get; set; }
[ForeignKey("CatId")]
public virtual Category Category { get; set; }
[ForeignKey("CountryId")]
public virtual Country Country { get; set; }
[ForeignKey("StateId")]
public virtual States States { get; set; }
[ForeignKey("CityId")]
public virtual City City { get; set; }
public Item()
{
Uid = Convert.ToInt32(HttpContext.Current.User.Identity.Name.Split('|')[1]);
}
}
and here my create action result
public ActionResult Create()
{
var catlist = db.Categories.Select(x => new { id = x.id, name = x.name }).ToList();
SelectList sl = new SelectList(catlist.AsEnumerable(), "id", "name");
ViewBag.SelectCategories = sl;
var countrylist = db.CountryTb.Select(x => new { id = x.id, name = x.name }).ToList();
SelectList s2 = new SelectList(countrylist.AsEnumerable(), "id", "name");
ViewBag.SelectCountry = s2;
return View();
}
[HttpPost]
public ActionResult Create(Item i)
{
db.Items.Add(i);
db.SaveChanges();
return RedirectToAction("Index");
}
if another way to save user id when login and get it when i need it on other table without problem please tell me how because i'm newbie in mvc

Answer 1

Just use the UserId.ToString() as name.
FormsAuthentication.SetAuthCookie(U.IdUser.ToString(), false);
Later you can get the id by using :
HttpContext.Current.User.Identity.Name
EDIT :
Set it initially like this :
var userDetails = U.NameUser.ToString() + " | " + U.IdUser.ToString();
FormsAuthentication.SetAuthCookie(userDetails, false);
Later you can get the id by using :
var savedUserDetails = HttpContext.Current.User.Identity.Name;