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' Script to toggle Windows Explorer display of hidden files, ' super-hidden files, and file name extensions Option Explicit Dim dblHiddenData, strHiddenKey, strSuperHiddenKey, strFileExtKey Dim strKey, WshShell On Error Resume Next strKey = "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced" strHiddenKey = strKey & "\Hidden" strSuperHiddenKey = strKey & "\ShowSuperHidden" strFileExtKey = strKey & "\HideFileExt" Set WshShell = WScript.CreateObject("WScript.Shell") dblHiddenData = WshShell.RegRead(strHiddenKey) If dblHiddenData = 2 Then WshShell.RegWrite strHiddenKey, 1, "REG_DWORD" WshShell.RegWrite strSuperHiddenKey, 1, "REG_DWORD" WshShell.RegWrite strFileExtKey, 0, "REG_DWORD" WScript.Echo "Windows Explorer will show hidden files and file " & _ "name extensions. You might need to change to another folder " & _ "or press F5 to refresh the view for the change to take effect." Else WshShell.RegWrite strHiddenKey, 2, "REG_DWORD" WshShell.RegWrite strSuperHiddenKey, 0, "REG_DWORD" WshShell.RegWrite strFileExtKey, 1, "REG_DWORD" WScript.Echo "Windows Explorer will not show hidden files or file " & _ "name extensions. (These are the default settings.) You might " & _ "need to change to another folder or press F5 to refresh the " & _ "view for the change to take effect." End If

No, the new setting in the West OU Desktop GPO is not reflected in the User7 RSoP because User7 has not yet logged on since the new GPO settings were implemented.

other data-specific languages. The set of language extensions that come with LINQ enables queries over several kinds of data stores to be formulated right into programming languages. Think of LINQ as a universal remote control, if you wish. At times, you ll use it to query a database; at others, you ll query an XML document. But you ll do all this in your favorite language, without having to switch to another one like SQL or XQuery. In chapter 2, we ll show you the details of how the programming languages have been extended to support LINQ. In chapter 3, you ll learn how to write LINQ queries. This is where you ll learn about query operators, query expressions, and expression trees. But you still have a few things to discover before getting there. Now that we have given you an idea of what LINQ is, let s discuss the motivation behind it, and then we ll review its design goals and a bit of history.

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Log off as Administrator, then log on as User7. Is the My Network Places icon vis ible on the desktop Why

You won t learn how to write a script in this chapter. You must know a scripting language, or else use the resources described in the following paragraphs to learn one. (If you know Visual Basic, you already know a scripting language.) Our intent here is to show you some of what you can do with Windows Script Host and help you find the widely scattered information you need to use it effectively.

No, the My Network Places icon is not visible on the desktop because the West OU Desktop GPO setting hides the icon.

Log off as User7, then log on as Administrator. Open the User7 RSoP console. Is the new setting in the West OU Desktop GPO reflected in the RSoP Why

Windows XP includes two programs that run WSH scripts. Cscript.exe is the command-line version, and Wscript.exe is the GUI version. Although this sounds like a big distinction, for most scripts the differences are pretty small. Try running Hello.vbs a one-line program described on page 545 with each program to see the difference. At the command prompt, type these two lines:

We also used auto-implemented properties in this chapter, but this new feature exists only for C# and isn t required for LINQ to exist. If you want to learn more about the new C# features and C# in general, we suggest you read another book from Manning: C# in Depth. VB.NET 9.0 introduces more language features, but they aren t related to LINQ, and we won t cover them in this book. This includes If as a ternary operator similar to C# s : operator and as a replacement for IIf. Other VB improvements include relaxed delegates and improved generic type inferencing. It s interesting to note that Visual Studio 2008 lets us write code that uses C# 3.0 or VB.NET 9.0 features but target .NET 2.0. In other words, we can run code that uses what we introduced in this chapter on .NET 2.0 without needing .NET 3.0 or 3.5 installed on the client or host machine, because all the features are provided by the compiler and don t require runtime or library support. One notable exception is extension methods, which require the System.Runtime.CompilerServices.ExtensionAttribute class; but we can introduce it ourselves or deliver the System.Core assembly that contains it with our .NET 2.0 program.