public async Task <ActionResult <List <Stationery> > > GetAllStationeries() { var result = await _clkService.findAllStationeriesAsync(); // if find data then return result else will return a String says Department not found if (result != null) { //Docs says that Ok(...) will AUTO TRANSFER result into JSON Type return(Ok(result)); } else { return(NotFound("Stationeries not found")); } }