public void Add(GroupPeople groupPeople)
        {
            //Go to GroupPeopleRepository, add the new groupPeople and return the (new) GroupPeopleID
            repository.Add(groupPeople);

            //Go to AssetOwnerRepository and add a new Owner by adding the GroupPeople(ID)
            repositoryAssetOwner.AddAssetOwnerGroupPeople(groupPeople.GroupPeopleID);

            //no need to return anyting, that's why here keep void!
        }