System.Data.DataRelationCollection.DataTableRelationCollection.RemoveCache C# (CSharp) Метод

            private void RemoveCache(DataRelation relation)
            {
                for (int i = 0; i < _relations.Count; i++)
                {
                    if (relation == _relations[i])
                    {
                        _relations.RemoveAt(i);
                        if (!_fParentCollection)
                        {
                            _table.UpdatePropertyDescriptorCollectionCache();
                        }
                        return;
                    }
                }
                throw ExceptionBuilder.RelationDoesNotExist();
            }