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Every ASP.NET web page has a fixed life cycle. When the ASP.NET runtime receives an incoming request for a given *.aspx file, the associated System.Web.UI.Page-derived type is allocated into memory using the type s default constructor. After this point, the framework will automatically fire a series of events. By default, the Load event is automatically accounted for, where you can add your custom code: public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { Response.Write("Load event fired!"); } } Beyond the Load event, a given Page is able to intercept any of the core events in Table 32-8, which are listed in the order in which they are encountered (consult the .NET Framework 4.0 SDK documentation for details on all possible events that may fire during a page s lifetime). Table 32-8. Select Events of the Page Type

Many of the WSE classes support security standards. One of the most simple and straightforward of these classes is the UsernameToken class, which represents user credentials. The UsernameToken information is added to the message as a SOAP header. However, it s added in a way that conforms to the WS-Security standard, which would be quite laborious to implement on your own. The benefit is that by implementing this general security model, you can add authentication without developing a proprietary approach, which could make it more difficult for third-party and cross-platform use of your web service. Also, it s likely that ASP .NET and WS-Security can provide a more secure, robust approach than one an individual developer or organization could develop (without investing considerable time and effort). Currently, the security infrastructure in the WSE has a few holes and doesn t fully deliver on its promise. However, it s easy to use and extend. To see how it works, it s helpful to consider a simple example.

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The framework uses this event to allocate any web controls, apply themes, establish the master page, and set user profiles. You may intercept this event to customize the process. The framework uses this event to set the properties of web controls to their previous values via postback or view state data. When this event fires, the page and its controls are fully initialized, and their previous values are restored. At this point, it is safe to interact with each web widget. There is, of course, no event of this name. This event simply refers to whichever event caused the browser to perform the postback to the web server (such as a Button click).

In the next example, you ll see how you can use the WSE to perform a secure call to the EmployeesService. The first step is to add the web reference. When you add a reference to the EmployeesService in a WSE-enabled project, Visual Studio will actually create two proxy classes. The first proxy class (which has the same name as the web service class) is the same as the web service generated in non-WSE projects. The second proxy class has the suffix WSE appended to its class name. This class comes from the Microsoft.Web.Services3.WebServicesClientProtocol class, and it includes support for WSE features (in this case, adding WS-Security tokens). Thus, to use WS-Security with the EmployeesService, you need to create a WSE-enabled project, add or refresh the web reference, and then modify your code so that it uses the EmployeeServiceWse proxy. Provided you ve taken those steps, you can add a new UsernameToken with your credentials using a single code statement: ' Create the proxy. Dim proxy As New EmployeesServiceWse() ' Add the WS-Security token. proxy.RequestSoapContext.Security.Tokens.Add (New UsernameToken(userName, password, PasswordOption.SendPlainText)) ' Bind the results. GridView1.DataSource = proxy.GetEmployees().Tables(0) As this code demonstrates, the security token is added as a UsernameToken object. It s inserted in the Security.Tokens collection of the RequestSoapContext, which is a SoapContext object that represents the request message you re about to send. To use this code as written, you need to import the following namespaces: Imports Microsoft.Web.Services3 Imports Microsoft.Web.Services3.Security Imports Microsoft.Web.Services3.Security.Tokens

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