public static string Getproduct_all_category() { try { PAWDStoreEntities context = new PAWDStoreEntities(); var Product = context.GetProductMenu().FirstOrDefault(); if (Product != null) { var AllData = context.GetProductSubCategory(Product.Menu_ID).ToList(); return(JsonConvert.SerializeObject(AllData)); } else { return(null); } } catch (Exception ex) { throw ex.InnerException; } }