public async Task <Exam> GetAsync(string name) => await Exams.AsQueryable().FirstOrDefaultAsync(x => x.Name == name);
public async Task <IEnumerable <Exam> > BrowseAsync(string name = "") => await Exams.AsQueryable().ToListAsync();
public async Task <Exam> GetAsync(Guid id) => await Exams.AsQueryable().FirstOrDefaultAsync(x => x.Id == id);