//post request to add an airline
public async Task <HttpResponseMessage> PostAsync(Airline airline)
{
List <Airline> airlines = await sqlDbHelper.GetAirlines();
//to check if there's no airline with the same code in the table
if (airlines.Find(a => a.Code == airline.Code) == null)
{
//in case it doesn't exist then the airline will be added and ok status code is returned
await sqlDbHelper.AddAirline(airline);
return(Request.CreateResponse(HttpStatusCode.OK, "Created"));
}
else
{
// in case an airline with the same code exists then it won't be added and cannot be created message is returned
return(Request.CreateResponse(HttpStatusCode.OK, "Cannot be created!"));
}
}