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In addition to providing developers with a more usable XML API, LINQ to XML also aims to take advantage of the advancements in programming languages that have occurred since the DOM/SAX was created nearly a decade ago Language features such as nullable types and functional construction are in wide use today, and developers working with XML should be able to leverage these language advancements in their daily work Additionally, LINQ itself brings many language advancements such as extension methods, anonymous types, and lambda expressions In order for LINQ to fulfill its goal of providing a single query API for all data, Microsoft needed to ensure the LINQ story surrounding XML was compelling It could be argued that instead of creating a brand-new API, Microsoft should have reworked its existing APIs Although Microsoft considered adding LINQ support to the existing APIs, retrofitting them would be difficult without breaking existing applications.

When you publish a static page on a Web server, that server stores your text in its file system. When a browser on a client sends a request for the page to the server, the server reads the file from its file system and sends it unmodified to the client browser. To change what the server sends, you must change the text file stored in the server s file system. If the static page contains hyperlinks or script that responds to events defined on the page, it s the browser on the requesting client machine that interprets what should happen next, and it executes any script on the client computer.

Figure 7-26. Sorting on two fields while maintaining the original field sequence in the query output.

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A reminder why Lookup properties can be confusing If you open the datasheet of qxmplChargeCalcSortedTwo and scroll down in the recordset, you ll find the Facility column sorted Main Campus Housing A, Main Campus Housing B, South Campus Housing C, and North Satellite Housing D. Why does South appear before North if the values are supposed to be sorted ascending Remember, in 5 I warned you about Lookup properties confusing the display you see. The information you re seeing in the datasheet comes from the Lookup defined on the FacilityID column in tblReservations you re seeing the related facility name from tblFacilities. However, the actual value of FacilityID is a number. You can click on the FacilityID column, open the Field Properties window, click the Lookup tab, and set the Display Control property to Text Box to see the actual number value. When you do this and look at the datasheet again, you ll see that the values are sorted correctly.

You learned in 4, Creating Your Database and Tables, how to define both field and table validation rules. You also learned in 5, Modifying Your Table Design, that you can change these rules even after you have data in your table. Access warns you if some of the data in your table doesn t satisfy the new rule, but it doesn t tell you which rows have problems.

An attempt to do so would cause a great deal of confusion among developers and would raise the complexity of those APIs to a point that they d be unusable for most tasks Since one of the primary goals was to make a more usable XML API, the complexity that changing existing APIs would bring made it a less viable option..

The best way to find out if any rows will fail a new field validation rule is to write a query to test your data before you make the change. The trick is you must specify criteria that are the converse of your proposed rule change to find the rows that don t match. For example, if you are planning to set the Required property to Yes or specify a Validation Rule property of 249

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Listing 1.9 Hello LINQ in C# improved with grouping and sorting (HelloLinqWithGroupingAndSorting.csproj)

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Smss is like any other user-mode process except for two differences: First, Windows considers Smss a trusted part of the operating system. Second, Smss is a native application. Because it s a trusted operating system component, Smss can perform actions few other processes can perform, such as creating security tokens. Because it s a native application, Smss doesn t use

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{ static void Main() { string[] words = { "hello", "wonderful", "linq", "beautiful", "world" }; var groups = Group words from word in words by length orderby word ascending group word by word.Length into lengthGroups orderby lengthGroups.Key descending select new {Length=lengthGroups.Key, Words=lengthGroups}; foreach (var group in groups) Print each group out { Console.WriteLine("Words of length " + group.Length); foreach (string word in group.Words) Console.WriteLine(" " + word); } } }

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