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Also note that the method of descriptors will only be called when the attribute is assigned on an object and will never be called when assigning the attribute on the class where the descriptor was first assigned. This behavior is by design, and prohibits the descriptor from taking complete control over its access. External code can still replace the descriptor by assigning a value to the class where it was first assigned. Also note that the return value from is irrelevant. The method itself is solely responsible for storing the supplied value appropriately.

NET state management won t work, and a new session will be created with each new request Unfortunately, your code has no way to identify this error condition..

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To try session state (and observe the potential problems), you can create the simple web service shown here. It stores a single piece of personalized information (the user name) and allows you to retrieve it later. public class StatefulService : System.Web.Services.WebService { [WebMethod(EnableSession=true)] public void StoreName(string name) { Session["Name"] = name; } [WebMethod(EnableSession=true)] public string GetName() { if (Session["Name"] == null) { return ""; } else { return (string)Session["Name"]; } } } When you test the StoreName() and GetName() web methods using the ASP.NET test page, you get the expected behavior. When you call GetName(), you receive whatever string you supplied the last time you called StoreName(). That s because web browsers support cookies without a hitch. By default, the proxy class doesn t share this ability. To see this problem in action, add a reference to the StatefulService in the Windows client. Then add a new button with the following event-handling code: private void cmdTestState_Click(object sender, System.EventArgs e) { // Create the proxy. StatefulService proxy = new StatefulService(); // Set a name. proxy.StoreName("John Smith"); // Try to retrieve the name. MessageBox.Show("You set: " + proxy.GetName()); } Unfortunately, this code doesn t work as you might expect. When you run it, you ll see the empty string shown in Figure 32-14.

To resolve this problem, you need to explicitly prepare the web service proxy to accept the session cookie by creating a cookie container (an instance of the System.Net.CookieContainer class). To correct this code, you can create the cookie container as a form-level variable, as shown here. This ensures that it lives as long as the enclosing class (the form) and can be reused in multiple methods in the same form, without losing the current web service session. public partial class Form1 : System.Windows.Forms.Form { private System.Net.CookieContainer cookieContainer = new System.Net.CookieContainer(); ... } Now you simply need to attach this cookie container to the proxy class before you call any web method: private void cmdTestState_Click(object sender, System.EventArgs e) { StatefulService proxy = new StatefulService(); proxy.CookieContainer = cookieContainer; proxy.StoreName("John Smith"); MessageBox.Show("You set: " + proxy.GetName()); } Now both web method calls use the same session, and the user name appears in the message box, as shown in Figure 32-15.

Since descriptors short-circuit attribute access, you need to take care when setting values on the attached object. You can t simply set the value on the object using ; attempting to do so will call the descriptor again, resulting in infinite recursion. Python provides another way to access an object s namespace: the attribute. Available on all Python objects, is a dictionary representing all values in the object s namespace. Accessing this dictionary directly bypasses all of Python s standard handling with regard to attributes, including descriptors. Using this, a descriptor can set a value on an object without triggering itself. Consider the following example.

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