public IDatastore TransformData(DesignerItemBase transformationItem, List <IDatastore> dataStores, ReportProgressMethod reportProgressMethod)
        {
            var transformationItemConfiguration = objectResolver.LoadItemConfiguration(transformationItem.ID) as TransformationConfiguration;

            IConnection transformationConnectionObject = null;

            if (transformationItemConfiguration.SelectedConnectionConfigurationId.Equals(Guid.Empty) == false)
            {
                transformationConnectionObject = objectResolver.GetConnection(transformationItemConfiguration.SelectedConnectionConfigurationId);
            }
            foreach (var dataStore in dataStores)
            {
                dataStore.ApplyFilter(transformationItemConfiguration.DataFilter);
            }

            IModule transformationObject = objectResolver.GetModule(transformationItem.ID, transformationItem.ModuleDescription.ModuleType);

            if (transformationObject is IDataTransformation)
            {
                ((IDataTransformation)transformationObject).TransformData(transformationConnectionObject, null, dataStores.First(), reportProgressMethod);
                return(dataStores.First());
            }
            else if (transformationObject is IDataMerge)
            {
                if (dataStores.Count != 2)
                {
                    throw new Exception("Make sure to connect exactly two incoming datasources on JoinRecords transformations!");
                }
                var mergedStore = ((IDataMerge)transformationObject).TransformData(transformationConnectionObject, null, dataStores[0], dataStores[1], reportProgressMethod);
                return(mergedStore);
            }
            else
            {
                throw new Exception("Tranformation does not implement a valid Tranformation-Interface!");
            }
        }