public override void UpdateLastProcessedItemVersion(Dictionary <string, string> itemVersionPair, long lastChangeGroupId, Guid sourceId)
        {
            if (itemVersionPair.Count() == 0)
            {
                return;
            }

            using (RuntimeEntityModel context = RuntimeEntityModel.CreateInstance())
            {
                foreach (var itemVerion in itemVersionPair)
                {
                    string itemId  = itemVerion.Key;
                    string version = itemVerion.Value;
                    var    query   =
                        from l in context.RTLastProcessedItemVersionsSet
                        where l.ItemId.Equals(itemId) &&
                        l.MigrationSourceId.Equals(sourceId)
                        select l;

                    if (query.Count() > 0)
                    {
                        if (string.IsNullOrEmpty(query.First().Version))
                        {
                            query.First().Version = version;
                        }
                        else
                        {
                            int inDbVersion = int.Parse(query.First().Version);
                            int newVersion  = int.Parse(version);
                            if (newVersion > inDbVersion)
                            {
                                query.First().Version = version;
                            }
                        }
                    }
                    else
                    {
                        var newEntry = RTLastProcessedItemVersions.CreateRTLastProcessedItemVersions(sourceId, itemId, version);
                        context.AddToRTLastProcessedItemVersionsSet(newEntry);
                    }
                }

                context.TrySaveChanges();
            }
        }