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The GridView control has a CommandField column, which automatically creates a Delete link for each row of data. If the user clicks a Delete link, the GridView deletes that row of data by calling its data source control, ProjectListDataSource. The result is a DeleteObject event handled in the page: protected void ProjectListDataSource_DeleteObject( object sender, Csla.Web.DeleteObjectArgs e) { try { ProjectTracker.Library.Project.DeleteProject( new Guid(e.Keys["Id"].ToString())); e.RowsAffected = 1; } catch (Csla.DataPortalException ex) { this.ErrorLabel.Text = ex.BusinessException.Message; e.RowsAffected = 0; } catch (Exception ex) { this.ErrorLabel.Text = ex.Message; e.RowsAffected = 0; } } Again, the DataKeyNames property being set in the GridView means that the Id column value from the row automatically flows into this event handler through e.Keys. That value is converted to a Guid object so that the static DeleteProject() method on the Project class can be called. The result is immediate deletion of the related project data.

This code is for a simple web page; you don t need your web page to display anything exciting. You just need the code-behind for your page to simulate a long-running request by sending the current thread to sleep for 10 seconds, as shown below:

Having discussed all the core business functionality of the page, let s look at the authorization code. Like in RolesEdit, the authorization rules themselves are in the business class, and the UI code simply uses that information to enable and disable various UI controls as the page loads: protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) ApplyAuthorizationRules(); else ErrorLabel.Text = string.Empty; } private void ApplyAuthorizationRules() { this.GridView1.Columns[ this.GridView1.Columns.Count - 1].Visible = Project.CanDeleteObject(); NewProjectButton.Visible = ProjectTracker.Library.Project.CanAddObject(); }

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I ve had people tell me that this is an overly paranoid attitude, but I ve been burned too many times: any time an interface is exposed (Windows, web, XML, and so on) so that clients outside your control can use it, you should assume that the interface will be misused. Often, this misuse is unintentional for example, someone may write a buggy macro to automate data entry. That s no different than if they made a typo while entering the data by hand, but user-entered data is always validated before being accepted by an application. The same must be true for automated data entry as well, or your application will fail.

protected void Page_Load(object sender, EventArgs e) { Thread.Sleep(10000); }

When the page is loaded, the ApplyAuthorizationRules() method makes sure that the CommandField column in the GridView is only visible if the user is authorized to delete Project objects. It also hides the NewProjectButton control if the user isn t allowed to add Project objects. The end result is that a user who can t delete or add data is still allowed to view the list of projects, and they can even click on a project s name to get more details in the ProjectEdit page.

This scenario occurs in three main architectures: Windows smart clients, rich Internet applications (RIAs), and SOA systems. If you deploy a WPF or Windows Forms client application to external workstations, you should design it as a stand-alone application that calls your server application through services. 21 shows how you can do this with the object-oriented concepts in this book. You may create an RIA with Asynchronous JavaScript and XML (Ajax) technologies or newer technologies such as Silverlight. In either case, the RIA often validates data or otherwise provides a richer experience for the user, but your server code should assume that the RIA didn t do anything it was supposed to. It is far too easy for a user to subvert your client-side JavaScript or otherwise bypass client-side processing as such, nothing running in an RIA can be trusted. The code running in the browser should be viewed as a separate application that is not trusted by the server application. Service-oriented systems imply that there s one or more (potentially unknown) applications out there consuming your services. The very nature of SOA means that you have no control over those applications, so it would be foolish to assume they ll provide valid input to your services. A healthy dose of paranoia is critical when building any service for an SOA system. As you ll see, you can use the object-oriented concepts and techniques shown in this book to create smart client applications that call services on your servers. You can use the same concepts to create the services themselves. You can also use them to create web applications ranging from simple Web Forms to Ajax to Silverlight.

Now that you have a web page that simulates long-running requests, you need to put your web server under extreme load by hammering it with requests.

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