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The format characters are not specific to the GridView. You can use them with other controls, with data-bound expressions in templates (as you ll see later in the Using GridView Templates section), and as parameters for many methods. For example, the Decimal and DateTime types expose their own ToString() methods that accept a format string, allowing you to format values manually.

In 1, you learned about types and the instanceof operator. Type hinting is effectively instanceof meets method signature; function(type $param) would be a type-hinted function.

If you need the ultimate flexibility of templates, the FormView provides a template-only control for displaying and editing a single record. The beauty of the FormView template model is that it matches the model of the TemplateField in the GridView quite closely. This means you can work with the following templates:

The GridView exposes a rich formatting model that s based on styles. Altogether, you can set eight GridView styles, as described in Table 17-5.

ItemTemplate EditItemTemplate InsertItemTemplate FooterTemplate HeaderTemplate EmptyDataTemplate PagerTemplate

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Configures the appearance of the header row that contains column titles, if you ve chosen to show it (if ShowHeader is True). Configures the appearance of every data row. If set, applies additional formatting to every other row. This formatting acts in addition to the RowStyle formatting. For example, if you set a font using RowStyle, it is also applied to alternating rows, unless you explicitly set a different font through AlternatingRowStyle. Configures the appearance of the row that s currently selected. This formatting acts in addition to the RowStyle formatting.

Note Unlike the GridView and DetailsView, which allow you to add as many TemplateField objects as you want,

Table 17-5. GridView Styles (Continued)

the FormView allows just a single copy of each template. If you want to show multiple values, you must add multiple binding expressions to the same ItemTemplate.

Type hinting is especially important when working with customized exceptions. By using type hinting and multiple catch blocks, you will be able to catch certain types of errors before others. As explained earlier, catch blocks allow you to specify the type of exception to be caught, and you can have multiple catch blocks. Think of this as if the instanceof operator were applied to each catch block; if it returned true, then that block would be the one that was executed. Listing 4-7 shows how to implement multiple catch blocks with different exception types. Listing 4-7. Type Hinting Exceptions class firstException extends Exception {} class secondException extends Exception {} try { //Code that throws exceptions } catch (firstException $e) { //What to do when firstException is thrown } catch (secondException $e) { //What to do when secondException is thrown } catch (Exception $e) { //What to do for all other exceptions }

Configures the appearance of the row that s in edit mode. This formatting acts in addition to the RowStyle formatting. Configures the style that s used for the single empty row in the special case where the bound data object contains no rows. Configures the appearance of the footer row at the bottom of the GridView, if you ve chosen to show it (if ShowFooter is True). Configures the appearance of the row with the page links, if you ve enabled paging (set AllowPaging to True).

You can use the same template content you use with a TemplateField in a GridView in the FormView. Earlier in this chapter, you saw how you can use a template field to combine the stock information of a product into one column (as shown in Figure 16-12). Here s how you can use the same template in the FormView: <asp:FormView ID="FormView1" <ItemTemplate> <b>In Stock:</b> <%# Eval("UnitsInStock") <br /> <b>On Order:</b> <%# Eval("UnitsOnOrder") <br /> <b>Reorder:</b> <%# Eval("ReorderLevel") <br /> </ItemTemplate> </asp:FormView> runat="server" DataSourceID="sourceProducts"> %> %> %>

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