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Want to create a GridView that scrolls inside a web page It s easy. Just place the GridView inside a Panel control, set the appropriate size for the panel, and set the Panel.ScrollBars to Auto, Horizontal, Vertical, or Both.

A property from another control on the page. A value from the current query string. A value stored in the current user s session. A value from any cookie attached to the current request. A value from the current user s profile (see 24). A value posted to the page from an input control. Usually, you ll use a control property instead, but you might need to grab a value straight from the Forms collection if you ve disabled view state for the corresponding control.

{0:F}

Each BoundField column provides a DataFormatString property that you can use to configure the appearance of numbers and dates using a format string. Format strings are generally made up of a placeholder and format indicator, which are wrapped inside curly brackets. A typical format string looks something like this: {0:C} In this case, the 0 represents the value that will be formatted, and the letter indicates a predetermined format style. In this case, C means currency format, which formats a number as a dollar figure (so 3400.34 becomes $3,400.34). Here s a column that uses this format string: <asp:BoundField DataField="Price" HeaderText="Price" DataFormatString="{0:C}" /> Table 10-3 shows some of the other formatting options for numeric values. Table 10-3. Numeric Format Strings

You don t need to remember the different tag names, as Visual Studio provides a handy editor that lets you create your command and define your parameters (see Figure 9-9). To see this dialog box, click the ellipsis ( ) next to the SelectQuery property in the Properties window. When you type a command that uses one or more parameters, click the Refresh Parameters button, and the list of parameters will appear. You can then choose the mapping for each parameter by making a choice in the Parameter Source box.

dddd, MMMM dd, yyyy HH:mm:ss aa (for example: Monday, January 30, 2005 10:00:23 AM) yyyy-MM-dd HH:mm:ss (for example: 2005-01-30 10:00:23) MMMM dd (for example: January 30) M/d/yyyy HH:mm:ss aa (depends on localespecific settings) (for example: 10/30/2002 10:00:23 AM)

{0:C}

Figure 9-9. Configuring parameter binding at design time For example, you could split the earlier example into two pages. In the first page, define a list control that shows all the available cities: <asp:SqlDataSource ID="sourceEmployeeCities" runat="server" ProviderName="System.Data.SqlClient" ConnectionString="<%$ ConnectionStrings:Northwind %>" SelectCommand="SELECT DISTINCT City FROM Employees"> </asp:SqlDataSource> <asp:ListBox ID="lstCities" runat="server" DataSourceID="sourceEmployeeCities" DataTextField="City"></asp:ListBox><br /> Now, you ll need a little extra code to copy the selected city to the query string and redirect the page. Here s a button that does just that: protected void cmdGo_Click(object sender, EventArgs e) { Response.Redirect("QueryParameter2.aspx city=" + lstCities.SelectedValue); } Finally, the second page can bind the GridView according to the city value that s supplied in the query string: <asp:SqlDataSource ID="sourceEmployees" runat="server" ProviderName="System.Data.SqlClient" ConnectionString="<%$ ConnectionStrings:Northwind %>" SelectCommand="GetEmployeesByCity" SelectCommandType="StoredProcedure">

{0:s} {0:M} {0:G}

<SelectParameters> <asp:QueryStringParameter Name="City" QueryStringField="city" /> </SelectParameters> </asp:SqlDataSource>

$1,234.50 Brackets indicate negative values: ($1,234.50). Currency sign is locale-specific: ( 1,234.50). 1.234.50E+004 45.6% Depends on the number of decimal places you set. {0:F3} would be 123.400. {0:F0} would be 123.

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 this chapter), 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.

When you deal with an outside resource such as a database, you need to protect your code with a basic amount of error-handling logic Even if you ve avoided every possible coding mistake, you still need to defend against factors outside your control for example, if the database server isn t running or the network connection is broken You can count on the SqlDataSource to properly release any resources (such as connections) if an error occurs However, the underlying exception won t be handled Instead, it will bubble up to the page and derail your processing As with any other unhandled exception, the user will receive a cryptic error message or an error page This design is unavoidable if the SqlDataSource suppressed exceptions, it could hide potential problems and make debugging extremely difficult.

{0:E} {0:P} {0:F }