public HttpResponseMessage Put(Workflow workflow)
        {
            if (repository.EditWorkflow(workflow))
            {
                DataSourceResult result = new DataSourceResult
                {
                    Data = new[] { workflow },
                    Total = 1
                };

                HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.OK, result);
                response.Headers.Location = new Uri(Url.Link("DefaultApi", new { id = workflow.WorkflowID }));
                return response;
            }
            else
                return Request.CreateResponse(HttpStatusCode.BadRequest, ModelState);
        }
        public HttpResponseMessage Post(Workflow workflow)
        {
            // set default value for user id
            if (workflow.OwnerID == 0) workflow.OwnerID = 1;
            if (workflow.WorkerID == 0) workflow.WorkerID = 1;

            if (repository.AddWorkflow(workflow))
            {
                DataSourceResult result = new DataSourceResult
                {
                    Data = new[] { workflow },
                    Total = 1
                };

                HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.Created, result);
                response.Headers.Location = new Uri(Url.Link("DefaultApi", new { id = workflow.WorkflowID }));
                return response;
            }
            else
                return Request.CreateResponse(HttpStatusCode.BadRequest, ModelState);
        }