private static void DeletingAndUpdatingCars(CarDbContext db)
{
var cars = db.Cars.Where(c => c.Price > 15000).ToList();
db.RemoveRange(cars);
// this make query for every car
// db.SaveChanges(); - even without Savechanges
var cars2 = db.Cars
.Where(c => c.Price > 15000);
/* .Delete();*/ // using Z.EntityFramework.Plus optimize the delete query
var cars3 = db.Cars.Where(c => c.Price < 20000);
//.Update(c => new Car { Price = c.Price * 1.2M });
}