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A logon script is a program that runs each time the user logs on. For more information, see Using Scripts That Run at Logon, Logoff, Startup, and Shutdown, page 478. (With the Net User command, you can specify the script location with the /Scriptpath switch.) 475

10-11

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This doesn t mean that object initializers are an alternative to writing good constructors. Object initializers and constructors are language features that complement each other. You should still define the appropriate set of constructors for your types. Constructors help prevent the creation of objects that aren t completely initialized and define the correct initialization order for an object s members. After these syntactic improvements, let s add new functionality to our example. We ll do this with the help of lambda expressions.

Each of the settings in the Administrative Templates node can be:

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t i v e Te m p l a t e s n o d e i n t h e U s e r C o n f i g u r a t i o n n o d e a r e s a v e d i n t h e

The home folder is a folder in which a user can store his or her files and programs. Although most programs use My Documents as the default folder for File Open and File Save, some older programs use the home folder. The home folder is also the initial current folder for Command Prompt sessions. The home folder can be a local folder or on a shared network drive, and multiple users can share a common home folder. To specify a local home folder, enter a path specification in the Local Path text box. To use a folder on a network server as a home folder, choose Connect and select a drive letter (Windows maps the folder to this letter at each logon) and specify the full network path to the folder. (With the Net User command, you can specify the script location with the /Homedir switch.) If you don t specify a home folder, Windows uses %UserProfile% as the home folder.

information that is specific to Group Policy in one of the following four reserved trees:

address => address.City == "Paris"

Figure 13-3.

HKEY_LOCAL_MACHINE\Software\Policies (computer settings)

Note Local Users And Groups is not available in Windows XP Home Edition. You can achieve the same result, however, by using the /Profilepath switch with the Net User command. For details, type net help user at a command prompt.

HKEY_CURRENT_USER\Software\Policies (user settings)

Your files are missing, or you have two profiles. A common problem with profiles is that, for one reason or another, you end up with more than one profile for a user account. The symptoms are deceiving: All of a sudden, your documents are missing, programs are missing from the Start menu, or your settings have changed. This usually occurs when you join a domain and then log on using the same user name as you used before joining the domain. In this case, you have (perhaps unwittingly) created two user accounts: a local account and a domain account. And each account is associated with its own profile.

HKEY_LOCAL_MACHINE\Software\Microsoft\ Windows\CurrentVersion\Policies (computer settings) HKEY_CURRENT_USER\Software\Microsoft\ Windows\CurrentVersion\Policies (user settings)

As a part of our tour of the new language features that are enablers for LINQ, we ll now introduce lambda expressions, which come from the world of the lambda calculus. Many functional programming languages such as Lisp use lambda notations to define functions. In addition to allowing the expression of LINQ queries, the introduction of lambda expressions into C# and VB.NET can be seen as a step toward functional languages.