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The next example shows a typical use of cookies to store a customer name (Figure 8-8). To try this example, begin by running the page, entering a name, and clicking the Create Cookie button. Then, close the browser, and request the page again. The second time, the page will find the cookie, read the name, and display a welcome message.

An exception should be used for any type of error that is not supposed to occur in normal code execution. For example, you might implement an exception in a section of code that connects to an external database, to handle the possibility of a database connection failure.

Figure 8-8. Displaying information from a custom cookie Here s the code for this page: public partial class CookieExample : System.Web.UI.Page { protected void Page_Load(Object sender, EventArgs e) { HttpCookie cookie = Request.Cookies["Preferences"]; if (cookie == null) { lblWelcome.Text = "<b>Unknown Customer</b>"; } else { lblWelcome.Text = "<b>Cookie Found.</b><br /><br />"; lblWelcome.Text += "Welcome, " + cookie["Name"]; } } protected void cmdStore_Click(Object sender, EventArgs e) {

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SqlClient" ConnectionString="<%$ ConnectionStrings:Northwind %>" SelectCommand="SELECT * FROM Products WHERE ProductID=@ProductID"> <SelectParameters> <asp:ControlParameter ControlID="lstProduct" Name="ProductID" PropertyName="SelectedValue" /> </SelectParameters> </asp:SqlDataSource> You always indicate parameters 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 @ProductID parameter comes from the lstProductSelectedValue property In other words, you are binding a value that s currently in a control to place it into a database.

// Check for a cookie, and only create a new one if // one doesn't already exist. HttpCookie cookie = Request.Cookies["Preferences"]; if (cookie == null) { cookie = new HttpCookie("Preferences"); } cookie["Name"] = txtName.Text; cookie.Expires = DateTime.Now.AddYears(1); Response.Cookies.Add(cookie); lblWelcome.Text = "<b>Cookie Created.</b><br /><br />"; lblWelcome.Text += "New Customer: " + cookie["Name"]; } }

command. (You could also use the SelectedText property to get the currently displayed text, which is the ProductName in this example.) Now all you need to do is bind the SqlDataSource to the remaining controls where you want to display information. This is where the example takes a slightly different turn. In the previous version of the record editor, you took the information and used a combination of values to fill in details in a label and a list control. This type of approach doesn t work well with data source controls. First, you can bind only a single data field to most simple controls such as lists. Second, each bound control makes a separate request to the SqlDataSource, triggering a separate database query. This means if you bind a dozen controls, you ll perform the same query a dozen times, with terrible performance. You can alleviate this problem with data source caching (see 26), but it indicates you aren t designing your application in a way that lends itself well to the data source control model. The solution is to use one of the rich data controls, such as the GridView, DetailsView, or FormView. These controls have the smarts to show multiple fields at once, in a highly flexible layout. You ll learn about these three controls in detail in the next chapter, but the following example shows a simple demonstration of how to use the DetailsView. The DetailsView is a rich data control that s designed to show multiple fields in a data source. As long as its AutoGenerateRows is True (the default), it creates a separate row for each field, with the field caption and value. Figure 16-12 shows the result.

Note You ll find that some other ASP.NET features use cookies. Two examples are session state (which allows

Figure 16-12. Displaying full product information in a DetailsView Here s the basic DetailsView tag that makes this possible: <asp:DetailsView ID="detailsProduct" runat="server" DataSourceID="sourceProductDetails" />

Exceptions are implemented by the addition of three keywords: try, catch, and throw, as well as the creation of the built-in Exception base class. These language constructs allow you to run error-prone sections of code and recover from failure.

you to temporarily store user-specific information in server memory) and forms security (which allows you to restrict portions of a website and force users to access it through a login page). 19 discusses forms security, and the next section of this chapter discusses session state.

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