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and opens the corresponding file These factors make them a poor choice for complex or private information or large amounts of data Some users disable cookies on their browsers, which will cause problems for web applications that require them Also, users might manually delete the cookie files stored on their hard drives But for the most part, cookies are widely adopted and used extensively on many websites Before you can use cookies, you should import the SystemNet namespace so you can easily work with the appropriate types: using SystemNet; Cookies are fairly easy to use Both the Request and Response objects (which are provided through Page properties) provide a Cookies collection The important trick to remember is that you retrieve cookies from the Request object, and you set cookies using the Response object To set a cookie, just create a new HttpCookie object.

Listing 12-16. Training Class Table Data (db/data/training_class_data.sql)

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Some (or many!) of your domain objects and service objects may be littered with code that deals with low-level implementation details like transaction management and collaborating object lookup These details don t have anything to do with the core business domain that the application is modeling, but rather they are the necessary evils of a large-scale software application OOP is a great paradigm that looks and sounds wonderful on paper, but in the real world it begins to break down a bit as objects become cluttered with the necessary-but-evil low-level implementation details Certainly details like logging code and object lookups aren t the worst thing in the world, and like anything else, good coding practices can help mitigate many of the problems associated with such low-level details So what s a developer to do The newest paradigms to hit the scene are aspect-oriented programming (AOP) and dependency injection (DI).

You can then fill it with string information (using the familiar dictionary pattern) and attach it to the current web response: // Create the cookie object HttpCookie cookie = new HttpCookie("Preferences"); // Set a value in it cookie["LanguagePref"] = "English"; // Add another value cookie["Country"] = "US"; // Add it to the current web response ResponseCookiesAdd(cookie); A cookie added in this way will persist until the user closes the browser and will be sent with every request To create a longer-lived cookie, you can set an expiration date: // This cookie lives for one year cookieExpires = DateTimeNowAddYears(1); You retrieve cookies by cookie name using the RequestCookies collection: HttpCookie cookie = RequestCookies["Preferences"]; // Check to see whether a cookie was found with this name.

// This is a good precaution to take, // because the user could disable cookies, // in which case the cookie will not exist string language; if (cookie != null) { language = cookie["LanguagePref"]; }.

INSERT INTO training_classes (name) VALUES ('Practical Exopaleontology'), ('Pro Quantum Biology');

The only way to remove a cookie is by replacing it with a cookie that has an expiration date that has already passed. This code demonstrates the technique: HttpCookie cookie = new HttpCookie("LanguagePref"); cookie.Expires = DateTime.Now.AddDays(-1); Response.Cookies.Add(cookie);

The next example shows a typical use of cookies to store a customer name. If the name is found, a welcome message is displayed, as shown in Figure 7-8.

AOP helps solve the problem of implementing low-level functionality that applies to many classes in a system, like logging or error handling, without.

Make a directory called data under the db directory, and save this as db/data/ training_class_data.sql. Import it with the following command:

Figure 7-8. 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) { // 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"]; } }

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

Next, set up your routes, as shown in Listing 12-17.

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