internal void RemoveFoodSpecialDate(Guid?foodid, specialdate sd)
{
food food = db.food.Find(foodid);
food.specialdate.Remove(sd);
db.SaveChanges();
}
internal specialdate CreateSpecialDate(string dateStr)
{
specialdate sd = new specialdate()
{
id = Guid.NewGuid(),
date = dateStr
};
db.specialdate.Add(sd);
db.SaveChanges();
return(sd);
}