public void Add(int ParticipantID, Guid GroupID)
        {
            var lst = new ParticipantInGroups
            {
                IsDeleted     = false,
                IsEnabled     = true,
                GroupID       = GroupID,
                participant   = _participant.Find(ParticipantID),
                ParticipantID = ParticipantID
            };

            _partInGroups.Add(lst);
        }
        public void Add(PartInGroupsModel viewModel)
        {
            var lst = new ParticipantInGroups
            {
                IsDeleted     = false,
                IsEnabled     = true,
                GroupID       = viewModel.GroupID,
                participant   = _participant.Find(viewModel.ParticipantID),
                ParticipantID = viewModel.ParticipantID
            };

            _partInGroups.Add(lst);
        }