private IEnumerable <Student> GetAllStudent() { List <Student> list = new List <Student>(); var students = _userService.GetAllUserInRole("user"); foreach (var item in students) { Student student = new Student() { Name = item.Name, SurrName = item.Surrname }; var raitings = _ratingsService.GetAllRaitingsForUser(item.Id); if (raitings.Count() > 0) { student.AverageRate = raitings.Average(x => x.Grade); } list.Add(student); } return(list); }