//Product is FK
public List <Book> BookBusinessLogic_BookReturnByProductId(int productId)
{
List <Book> books = new List <Book>();
BookData bookData = new BookData();
DataTable dt = new DataTable();
dt = bookData.BookData_ProductImageByProductID(productId).Tables[0];
foreach (DataRow row in dt.Rows)
{
Book prodactImg = new Book();
// prodactImg.productImgB64 = row["productImgB64"].ToString();
books.Add(prodactImg);
}
return(books);
}