// BookPrice Check
 public bool bookPriceCheck(string bookPrice)
 {
     if (string.IsNullOrWhiteSpace(bookPrice))
     {
         return(false);
     }
     if (stringCheck(bookPrice, 5))
     {
         print.bookPriceOnlyNumber();
         return(true);
     }
     if (Convert.ToInt32(bookPrice) > 1000000)
     {
         print.bookPriceOverMessage();
         return(true);
     }
     return(false);
 }