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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.

Custom cookies provide another way you can store information for later use. Cookies are small files that are created on the client s hard drive (or, if they re temporary, in the web browser s memory). One advantage of cookies is that they work transparently without the user being aware that information needs to be stored. They also can be easily used by any page in your application and even retained between visits, which allows for truly long-term storage. They suffer from some of the same drawbacks that affect query strings. Namely, they re limited to simple string information, and they re easily accessible and readable if the user finds and opens the corresponding file. These factors make them a poor choice for complex or private information or large amounts of data.

private string quotation; public string QuotationText { get {return quotation;} set {quotation = value;} } public Quotation(XmlNode quoteNode) { if ( (quoteNode.SelectSingleNode("source")) != null) qsource = quoteNode.SelectSingleNode("source").InnerText; if ( (quoteNode.Attributes.GetNamedItem("date")) != null) date = quoteNode.Attributes.GetNamedItem("date").Value; quotation = quoteNode.FirstChild.InnerText; } } }

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

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 parameter 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).