BExIS.Web.Shell.Areas.DCM.Controllers.FormController.LoadExternalXml C# (CSharp) Method

        public ActionResult LoadExternalXml()
        {
            string validationMessage = "";

            if (TaskManager == null) TaskManager = (CreateTaskmanager)Session["CreateDatasetTaskmanager"];

            if (TaskManager != null &&
                TaskManager.Bus.ContainsKey(CreateTaskmanager.METADATASTRUCTURE_ID) &&
                TaskManager.Bus.ContainsKey(CreateTaskmanager.METADATA_IMPORT_XML_FILEPATH))
            {

                //xml metadata for import
                string metadataForImportPath = (string)TaskManager.Bus[CreateTaskmanager.METADATA_IMPORT_XML_FILEPATH];

                if (FileHelper.FileExist(metadataForImportPath))
                {
                    XmlDocument metadataForImport = new XmlDocument();
                    metadataForImport.Load(metadataForImportPath);

                    // metadataStructure ID
                    long metadataStructureId = (Int64)TaskManager.Bus[CreateTaskmanager.METADATASTRUCTURE_ID];
                    MetadataStructureManager metadataStructureManager = new MetadataStructureManager();
                    string metadataStructrueName = metadataStructureManager.Repo.Get(metadataStructureId).Name;

                    // loadMapping file
                    string path_mappingFile = Path.Combine(AppConfiguration.GetModuleWorkspacePath("DIM"), XmlMetadataImportHelper.GetMappingFileName(metadataStructureId, TransmissionType.mappingFileImport, metadataStructrueName));

                    // XML mapper + mapping file
                    XmlMapperManager xmlMapperManager = new XmlMapperManager(TransactionDirection.ExternToIntern);
                    xmlMapperManager.Load(path_mappingFile, "IDIV");

                    // generate intern metadata without internal attributes
                    XmlDocument metadataResult = xmlMapperManager.Generate(metadataForImport, 1, true);

                    // generate intern template metadata xml with needed attribtes
                    XmlMetadataWriter xmlMetadatWriter = new XmlMetadataWriter(BExIS.Xml.Helpers.XmlNodeMode.xPath);
                    XDocument metadataXml = xmlMetadatWriter.CreateMetadataXml(metadataStructureId,
                        XmlUtility.ToXDocument(metadataResult));

                    XmlDocument metadataXmlTemplate = XmlMetadataWriter.ToXmlDocument(metadataXml);

                    // set attributes FROM metadataXmlTemplate TO metadataResult
                    XmlDocument completeMetadata = XmlMetadataImportHelper.FillInXmlValues(metadataResult,
                        metadataXmlTemplate);

                    TaskManager.AddToBus(CreateTaskmanager.METADATA_XML, completeMetadata);

                    //LoadMetadata(long datasetId, bool locked= false, bool created= false, bool fromEditMode = false, bool resetTaskManager = false, XmlDocument newMetadata=null)
                    return RedirectToAction("ImportMetadata", "Form",
                        new {metadataStructureId = metadataStructureId});

                }
            }

            return Content("Error Message :"+validationMessage);
        }