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The operations that can be performed on the types we ve just listed are those supported by the standard query operators. LINQ comes with a number of operators that provide useful ways of manipulating sequences and composing queries. Here is an overview of the families of the standard query operators: Restriction, Projection, Partitioning, Join, Ordering, Grouping, Set, Conversion, Equality, Element, Generation, Quantifiers, and Aggregation. As you can see, a wide range of operations is supported. We won t detail all of them, but we ll focus on the most important of them in section 4.4. Remember that the standard query operators are defined in the System.Linq.Enumerable class as extension methods for the IEnumerable<T> type, as we ve seen in chapter 3. These operators are called the standard query operators because we can provide our own custom query operators. Because query operators are merely extension methods for the IEnumerable<T> type, we re free to create all the query operators we wish. This allows us to enrich our queries with operations that the designers of LINQ overlooked and that aren t supported by the standard operators. We ll demonstrate this in chapter 12 when we cover extensibility. We ll soon use several query operators and demonstrate how to perform the supported operations we ve just presented. In order to be able to create our sample applications, we ll now take some time to create our first ASP.NET web sites and Windows Forms applications that work with LINQ.

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solving problems:

Microsoft Windows XP Inside Out, Second Edition Tip Calculate total data size before you start copying If you try to copy more data than will fit, the CD Writing Wizard, which manages the burning process, will complain immediately and make you remove some files from the staging folder. In other words, the wizard isn t able to copy as many files as will fit, saving the rest for a second CD. So you might as well save yourself some hassle and figure out in advance whether you ve overshot the limit. On the wizard s first page, you can type a name for the CD. The name you supply it can be up to 16 characters in length will help you identify the CD s contents when you open it later in Windows Explorer.

The Group Policy troubleshooting tools were discussed in detail in 11,

Use a PowerToy to generate CD slide shows If you save photos or other images to a CD, you can view them as a slide show, just as you can with photos on your hard disk by clicking View As A Slide Show in the task pane. Users of earlier versions of Windows don t have this snazzy feature, so if you share the CD with them, they ll need an image-viewing application. However, if you install the CD Slide Show Generator, a free PowerToy you can download the Microsoft PowerToys site at http:// www.microsoft.com/windowsxp/pro/downloads/powertoys.asp, the CD Writing Wizard includes an extra step, which offers to add a picture viewer to the CD. If you choose to include it on the CD, the picture viewer runs automatically when the CD is inserted into a computer running Windows 95 or later.

If you turn on verbose logging as discussed in 11, you can use the advanced diagnostic information provided in the Advanced Deployment Options dialog box to

In previous chapters, we used LINQ code in console applications. That was okay for simple examples, but most real-life projects take the form of web sites or Windows applications, not console applications. We ll now make the jump and start creating ASP.NET or Windows Forms applications that use LINQ. Support for LINQ is built into .NET 3.5 and Visual Studio 2008, so creating applications that use LINQ is not different than creating other applications. You simply need to use the standard project templates coming with Visual Studio. This is the case for both ASP.NET web sites and Windows Forms applications. We ll

The Recycle Bin provides protection against accidental erasure of files. In most cases, when you delete one or more files or folders, the deleted items go to the Recycle Bin, not into the ether. If you change your mind, you can go to the bin and recover the thrown-out items. Eventually, when the bin fills up, Windows begins emptying it, permanently deleting the files that have been there the longest. The following kinds of deletions do not go to the Recycle Bin:

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Files stored on removable disks Files stored on network drives Files deleted from compressed (zipped) folders

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