private IEnumerable <AppUser> GetSearchingResult(string search)
{
IEnumerable <AppUser> resultEmail = _userManager.FindUsersByEmail(search);
IEnumerable <AppUser> resultName = _userManager.FindUsersByName(search);
IEnumerable <AppUser> resultSurname = _userManager.FindUsersBySurname(search);
IEnumerable <AppUser> result = resultEmail.Union(resultName).Union(resultSurname).ToList();
return(result);
}
