private async Task productInListInitial(int productId, string username)
{
productOnsalelist pr = new productOnsalelist();
pr.ProductId = productId;
pr.username = username;
pr.date = DateTime.Now;
pr.quantity = 1;
_context.productOnsalelists.Add(pr);
await _context.SaveChangesAsync();
}
private async Task updateProductOnSale(productOnsalelist trans)
{
_context.Set <productOnsalelist>().AddOrUpdate(trans);
await _context.SaveChangesAsync();
}
