How to load data from GridView to FormView in different page...I'm new to ASP, still studying

This is the Excercise beneath, I got so confused

Create two ASP.NET pages named BookSummary.aspx and BookDetail.aspx. In BookSummary.aspx, use a GridView to display each book's Title column value. Also include a HyperLinkField that displays a link titled "View Details" that, when clicked, takes the user to BookDetail.aspx?BookID=BookID. In BookDetail.aspx, use a FormView control to display all the column values of the book whose BookID value was passed through the querystring. Customize the FormView's ItemTemplate so that the Title is displayed in a large, bold font. Format the Price column value as a currency; format the LastReadOn column value so that just the date is displayed. Finally, add a HyperLink control to the page that, when clicked, takes the user back to BookSummary.aspx.
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