Developer's Guide to Windows SharePoint Services 3.0

The code at the top of the page reads:

use System.Security;

this should read

using System.Security;

Add another directive to access the SPContext object:

using Microsoft.SharePoint;

Also, use SPContext.Current.Web rather than SPControl.Current.Web in the code.

The example requires CompletePart.webpart but the Directive Definition File (DDF) refers to Maximum.webpart.