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The scope of the item (does not apply to destructors) Indicates if the property is read, write, or read-write (applies only to properties) Allows you to specify that a field is a constant or read-only field (applies only to fields) Any custom attributes that apply to the item Read-only attribute containing the name of the file in which the item is located Indicates how (if) this class can be inherited: None, Abstract (MustInherit in VB), Sealed (NotInheritable in VB), and Static (no equivalent in VB) (does not apply to constructors) The name of this item Indicates if this item overrides or shadows an item with the same name or signature in the base class (applies only to C#) (applies only to properties or methods) Read-only attribute showing the signature of the property (applies only to properties) General comments about the item Description of the value returned (applies only to methods) Indicates if the item is static A summary of the item s purpose/functionality The type the item deals with the type of the value or the returned value type The definition of the value supplied to the property (applies only to properties)

The IIdentity interface exposes three simple properties: AuthenticationType is a string that indicates the type of authentication used by the identity object. When you are working with Windows, this value will be either Basic, Forms, Kerberos, NTLM, or Passport. (You will most likely find this value is NTLM as it is used by Windows for logon authentication on stand-alone systems.) IsAuthenticated is a Boolean value that represents whether the identity object has been authenticated. Name is, well, you know the name associated with the identity object.

The next chapter discusses reliable messaging and how it is implemented in WCF. Reliable messaging is an important concept in distributed computing; it enables reliable communication channels between multiple enterprises (on heterogeneous platforms) with failover mechanisms.

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While an interface supports essentially all of the same things that a class supports, there are a couple of differences. First, interface methods can only be public otherwise, why have an interface And second, there is no implementation in an interface it is just a set of method signatures. Aside from these two differences, interfaces behave the same as classes in the Class Designer.

Like the identity, the .NET Framework provides two principal objects: WindowsPrincipal and GenericPrincipal. The WindowsPrincipal object more or less maps to the Windows group and is also maintained by the Computer Management tool, as shown in Figure 19-2. (Group, principal, and role are all basically the same thing when it comes to role-based security hmmm, let s just make things confusing, shall we )

Figure 19-2. Groups in the Computer Management tool The GenericPrincipal is an object that contains the roles of an identity that you create dynamically at runtime. Both WindowsPrincipal and GenericPrincipal share the interface IPrincipal, which again makes things easier since methods need only use the interface to handle both types of principal.

WCF helps you implement reliable communications over an infrastructure that might be unreliable. Application infrastructure is prone to failure. Network connectivity often breaks, services might not always be available, and messages get lost. WCF provides you with the functionality to overcome these limitations in the infrastructure. You will learn in this chapter how to ensure reliable communication in a distributed environment where the application endpoints might be available only intermittently. Reliable messaging in WCF helps developers solve a number of challenges that have plagued them for many years. You will learn about the following in this chapter: The need for reliable messaging Challenges in implementing reliable messaging Reliable sessions Queuing support in WCF How to integrate with legacy applications using MSMQ

Refactoring is a fancy term for reorganizing code to make improvements in the architecture of an application. In some cases, it refers to going back and altering code to make it more efficient, but for the purposes of the Class Designer, the first definition applies. (Refactoring is available from a variety of locations, not just the Class Designer.)

Just as with identities, you can create your own custom principals using the IPrincipal interface, though I have found that GenericPrincipal has provided all the functionality I ve needed.

Note Refactoring is available only in C#. However, a VB Powertoy is available from www.gotdotnet.com,

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