C# XML Nodes

//SEMINARSELEKTION

                                    workshopstring = node["eventitem"].InnerText;
                                    

                                        if (workshopstring.Contains("Tag"))
                                        {

                                            TDMRTeilnahme = true;

                                            TDMRTeilnahme1.Set(executionContext, TDMRTeilnahme);
                                            tracingService.Trace("TDMRTeilnahme zugeordnet");

                                        }
                                        else if (workshopstring.Contains("Masch"))
                                        {

                                            tedx = true;
                                            TedX.Set(executionContext, tedx);
                                            tracingService.Trace("Teilnahme");
                                        }
                                        else
                                        {
                                            QueryExpression workshopquery = new QueryExpression("mrd_seminar");
                                            workshopquery.ColumnSet = new ColumnSet(true);
                                            workshopquery.Criteria.AddCondition("mrd_name", ConditionOperator.Equal, workshopstring);

                                            // query ausführen
                                            EntityCollection retrieveworkshop = service.RetrieveMultiple(workshopquery);

                                            if (retrieveworkshop.Entities.Count == 1)
                                            {
                                                                                              
                                                Entity Workshop1 = retrieveworkshop.Entities[0];
                                                Entity Workshop2 = retrieveworkshop.Entities[0];
                                                Entity Workshop3 = retrieveworkshop.Entities[0];
                                                Entity Workshop4 = retrieveworkshop.Entities[0];

                                                if (Workshop1 != null)
                                                {
                                                    WorkshopA.Set(executionContext, new EntityReference("mrd_seminar", Workshop1.Id));
                                                    tracingService.Trace("Workshop zugeordnet ", Workshop1.ToString());
                                                }
                                                else if (Workshop2 != null)
                                                {
                                                    WorkshopA.Set(executionContext, new EntityReference("mrd_seminar", Workshop2.Id));
                                                    tracingService.Trace("Workshop zugeordnet ", Workshop2.ToString());
                                                }
                                                else if (Workshop3 != null)
                                                {
                                                    WorkshopA.Set(executionContext, new EntityReference("mrd_seminar", Workshop3.Id));
                                                    tracingService.Trace("Workshop zugeordnet ", Workshop3.ToString());
                                                }
                                                else if (Workshop4 != null)
                                                {
                                                    WorkshopA.Set(executionContext, new EntityReference("mrd_seminar", Workshop4.Id));
                                                    tracingService.Trace("Workshop zugeordnet ", Workshop4.ToString());
                                                }

                                            }

                                        }

                                    //Variable clearen
                                    tracingService.Trace(workshopstring);
                                    workshopstring = null;
                                    return;

                                    //ENDE SEMINARVERGABE