Project Library - problem of choosing items to edit or delete

Hello,
I've to write a small program in ASP .NET
The program must include the intensity of follow things:
- Validation of the value you put in place by uLzytkownika
- Adding a new item to the database
- Search items in the database when: the name of the author and book title Lzki
- Remove items from the database
- Sorting of the database on all items
- Modification of the items in the database
- The appearance and functionality Ä d applications




So far, I wrote something like this:
Default.aspx


<%@ Page Language="C#" A ...