public async Task <int> RemoveCity(City city)
{
db.Cities.Remove(city);
return(await db.SaveChangesAsync());
}
public async Task <int> UpdateCity(City city)
{
db.Cities.Update(city);
return(await db.SaveChangesAsync());
}
public async Task <int> AddCity(City city)
{
db.Cities.Add(city);
return(await db.SaveChangesAsync());
}