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Ownership No ownership checks are made when you redirect My Documents to a user s home folder. Normally, folder redirection fails if a user is not the owner of the folder to which he or she is being redirected. Home directory property on the user object When you redirect My Docu ments to a user s home folder, the client computer finds the path for the user s home directory from the user object in Active Directory at logon time. If this path is not set correctly for the affected users, folder redirection fails.

An introduction to the key elements of the LINQ foundation Sequences Deferred query execution Query operators Query expressions Expression trees LINQ DLLs and namespaces

Table 15-4.

This relaxed security environment is why redirecting My Documents to a user s home folder is recommended only for organizations that have already deployed home folders and want to provide backward compatibility.

Defines objects that can be referenced by the script. Provides a reference to an external type library, allowing you to use defined constants from that type librar y. Isolates text or numeric data that should not be hardcoded in a script.

Do not redirect My Documents to a home directory location that is subject to encryp tion by the Encrypting File System (EFS), because only you or a domain administrator will be able to decrypt it. The user whose My Documents folder is redirected there will not be able to decrypt it.

To debug scripts, you first need to install Microsoft Script Debugger. You can download it from http://msdn.microsoft.com/downloads/list/webdev.asp. Also, if you want to debug a .wsf file, you must add the line < job debug="true" > to your script file. (It goes right below the <job> tag.) Without this line, the debugger will not open. Note After you have installed the debugger, the messages you see when you encounter a script error while you browse the Internet are different. At the bottom, the message asks, Do you want to debug the current page If you click Yes, the debugger appears with the page loaded. Because you are probably looking at someone else s site, however, you probably want to click No. You can find the documentation for Script Debugger at http://msdn.microsoft.com/scripting/ debugger. Keep in mind that you can use this same debugger to debug both client and server scripts for Web pages; most of the documentation is focused on those activities. (In fact, Windows Script Host might not be mentioned in the debugger documentation at all.) You start the debugger using command-line switches with the Cscript or Wscript commands. The //X switch starts the debugger, loads the script into the debugger, and stops at the first line of the script. The //D switch starts the debugger only when an error is encountered. It also loads the program in the debugger and stops at the line where it encountered the error. Here s an example of debugging a very simple script, which we call Debug.vbs:

The default locations for special folders that have not been redirected depend on the operating system that was in place previously (see Table 11-5).

In chapter 2, we reviewed the language additions made to C# and VB.NET: the basic elements and language innovations that make LINQ possible. In this chapter, you ll discover new concepts unique to LINQ. Each of these concepts builds on the new language features we presented in chapter 2. You ll now begin to see how everything adds up when used by LINQ. We ll start with a rundown of the language features we ve already covered. We ll then present new features that form the key elements of the LINQ foundation. In particular, we ll detail the language extensions and key concepts. This includes sequences, the standard query operators, query expressions, and expression trees. We ll finish this chapter by taking a look at how LINQ extends the .NET Framework with new assemblies and namespaces. At the end of this chapter, you should have a good overview of all the fundamental building blocks on which LINQ relies and how they fit together. With this foundation, you ll be ready to work on LINQ code.

main() Function main() x = 99 WScript.echo "Hello once" WScript.echox "Error 1 here" WScript.echo "Hello twice" End Function

Table 11-5

15

the name of your system drive)