public Guid Create(Nullable <System.Guid> quizId, Nullable <byte> partId, string name, Nullable <byte> order, string paragraph, string mediaPath) { var groupId = Guid.NewGuid(); var result = (int)db.qz_QuestionGroup_Create( groupId, quizId, partId, name, order, paragraph, mediaPath).Single(); if (result > 0) { return(groupId); } else { return(Guid.Empty); } }