trigger ContentTrg on ContentVersion (Before Insert, Before Update) {

                for(ContentVersion conObj : Trigger.New){
                    // If(conObj.TagCsv != null)
                     {  SYSTEM.DEBUG('############ conObj.TagCsv ' + conObj.TagCsv + ' Business_Model ' + conObj.Business_Model__c);
                           if(conObj.Business_Model__c != null)
                            conObj.TagCsv += ', ' + conObj.Business_Model__c ;
                           if(conObj.Account__r.Geo_HDS__c != null)
                            conObj.TagCsv += ', ' + conObj.Account__r.GEO_HDS__c;

                           SYSTEM.DEBUG('############ conObj.TagCsv ' + conObj.TagCsv);
                       }

                 }
}