private Int32 getPrimaryTupleCount(DatasetVersion datasetVersion)
{
List<Int64> versionIds = getPreviousVersionIds(datasetVersion);
Int32 tuplesCount = (versionIds == null || versionIds.Count() <= 0) ?
0
: DataTupleRepo.Query(p => versionIds.Contains(p.DatasetVersion.Id)).Select(p => p.Id)
.Count();
return (tuplesCount);
}