strICT.InFlow.Web.Controllers.PDesignerAPIController.DeleteState C# (CSharp) Method

        public void DeleteState(int id, int sid, int stid)
        {
             var _p = _db.PD_Processes.Find(id);
             if (User.Identity.Name.Equals(_p.LockedBy))
             {
                 PD_Subject i = _db.PD_Subjects.Find(id, sid);
                 var state = _db.PD_States.Find(id, sid, stid);

                 if (state != null)
                 {
                     var todelete = _db.PD_Transitions.Where(result => result.Source == state.Id && result.PD_Process_Id == id && result.PD_Subject_Id == sid || result.Target == state.Id && result.PD_Process_Id == id && result.PD_Subject_Id == sid);
                     _db.PD_Transitions.RemoveRange(todelete);
                     i.States.Remove(state);
                     _db.SaveChanges();
                 }
                 else
                 {
                     throw new HttpResponseException(HttpStatusCode.NotFound);
                 }
             }
        }