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The name of the field (for a row) or property (for an object) of the data item that you want to display in this column A format string that formats the field This is useful for getting the right representation of numbers and dates If True, the format string will be used to format the value even when it appears in a text box in edit mode The default is False, which means only the underlying normal will be used (114302 instead of $1,14302) Sets the text in the header and footer region of the grid, if this grid has a header (ShowHeader is True) and Footer (ShowFooter is True).

In the previous example, the complete query was hard-coded. Often, you won t have this flexibility. Instead, you ll want to retrieve a subset of data, such as all the products in a given category or all the employees in a specific city. The following example creates a master-details form using parameters. To create this example, you need two data sources. The first data source provides a list of cities (where various employees live). Here s the definition for this SqlDataSource: <asp:SqlDataSource ID="sourceEmployeeCities" runat="server" ProviderName="System.Data.SqlClient" ConnectionString="<%$ ConnectionStrings:Northwind %>" SelectCommand="SELECT DISTINCT City FROM Employees"> </asp:SqlDataSource>

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The header is most commonly used for a descriptive label such as the field name, while the footer can contain a dynamically calculated value such as a summary (a technique demonstrated in the section Summaries in the GridView toward the end of this chapter) To show an image in the header instead of text, set the HeaderImageUrl property If True, the value for this column can t be changed in edit mode No edit control will be provided Primary key fields are often read-only If False, the value for this column can t be set in insert mode If you want a column value to be set programmatically or based on a default value defined in the database, you can use this feature If False, the column won t be visible in the page (and no HTML will be rendered for it).

This data source fills a drop-down list with city values: <asp:DropDownList ID="lstCities" runat="server" DataSourceID="sourceEmployeeCities" DataTextField="City" AutoPostBack="True"> </asp:DropDownList> The list control has automatic postback enabled, which ensures that the page is posted back every time the list selection is changed, giving your page the chance to update its data-bound controls accordingly. The other option is to create a dedicated button (such as Select) next to the list control for initiating the postback. When you select a city, the second data source retrieves all the employees in that city. Here s the definition for the second data source: <asp:SqlDataSource ID="sourceEmployees" runat="server" ProviderName="System.Data.SqlClient" ConnectionString="<%$ ConnectionStrings:Northwind %>" SelectCommand="SELECT EmployeeID, FirstName, LastName, Title, City FROM Employees WHERE City=@City"> <SelectParameters> <asp:ControlParameter ControlID="lstCities" Name="City" PropertyName="SelectedValue" /> </SelectParameters> </asp:SqlDataSource> The trick here is the query is written using a parameter. Parameters are always indicated with an @ symbol, as in @City. You can define as many symbols as you want, but you must map each provider to another value. In this example, the value for the @City parameter is taken from the lstCities.SelectedValue property. However, you could just as easily modify the ControlParameter tag to bind to another property or control. Now when you run the page, you can view the employees in a specific city (see Figure 9-8).

This property gives you a convenient way to programmatically hide or show specific columns, changing the overall view of the data An expression that can be appended to a query to perform a sort based on this column Used in conjunction with sorting, as described in the Sorting the GridView section If True (the default), all text will be HTML encoded to prevent special characters from mangling the page You could disable HTML encoding if you want to embed a working HTML tag (such as a hyperlink), but this approach isn t safe It s always a better idea to use HTML encoding on all values and provide other functionality by reacting to GridView selection events The text that will be displayed for a null value The default is an empty string, although you could change this to a hard-coded value, such as (not specified).