quantity  = 1;
product_type  = Book;
price = 12.00;

<Books>
    <Book>
        <Quantity>1</Quantity>
        <Price>12</Price>
    </Book>
</Books>

string str = "1 Book price $12.00";
string[] strArray = str.split(' ');
quantity = Convert.toInt32(strArray[0]);
product_type  = strArray[1] ;
price = Convert.toDecimal(strArray[2].replace("$","") );