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); }