public void InsertOrUpdateProductSold(ProductsSold ps)
 {
     if (ps.Id == 0)
     {
         ProductsSolds.Add(ps);
     }
     SaveChanges();
 }
 public ProductsSold RefreshEntity(ProductsSold ps)
 {
     Entry(ps).State = EntityState.Detached;
     return(ProductsSolds.Where(psold => psold.Id == ps.Id)
            .SingleOrDefault());
 }