protected void Page_Load(object sender, EventArgs e)
 {
     if (!Page.IsPostBack)
     {
         var books = new BookCollection();
         books.FilerBookByIsbn("");
         rptBookDisplay.DataSource = books.BookList;
         rptBookDisplay.DataBind();
         FillDropDown();
     }
 }
    protected void HandlerClearSearch(object sender, EventArgs e)
    {
        txtIsbn.Text           = "";
        txtTitle.Text          = "";
        txtAuthor.Text         = "";
        txtPublisher.Text      = "";
        txtYear.Text           = "";
        ddlGenre.SelectedValue = "";

        var books = new BookCollection();

        books.FilerBookByIsbn("");
        rptBookDisplay.DataSource = books.BookList;
        rptBookDisplay.DataBind();
        FillDropDown();
    }