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Test Your Knowledge: Quiz
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Question 21-1. What sorts of data sources can you query with LINQ Question 21-2. What is the return type of a LINQ query Question 21-3. Which LINQ keyword returns the result of a query Question 21-4. If you re trying to return a complex type from a LINQ query, what language feature do you need to use Question 21-5. What data type is needed for the range variable in a LINQ query Question 21-6. What does a lambda expression return, when used in a LINQ query Question 21-7. What reference do you need to add to your project to use LINQ to SQL
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21: LINQ
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Question 21-8. What attribute do you use to define a class as representing a SQL table Question 21-9. How do you add table classes to your application using the Object Relational Designer Question 21-10. What parameters do you need to pass to the constructor of the data context class when you re using the Object Relational Designer
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Exercise 21-1. For the first exercise in this chapter, we re going to bring back the good old Box class from earlier in the book. It s a quick and easy class, with Length, Width, and Height properties, and a quick method to display a box. Here s the code for the class:
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public class Box { public int Length { get; set; } public int Width { get; set; } public int Height { get; set; } public void DisplayBox( ) { Console.WriteLine("{0}x{1}x{2}", Length, Width, Height); } }
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Create a List of Box objects, at least five, with dimensions of whatever you like, and then use a LINQ query to extract all those boxes with a Length and Width greater than 3. Exercise 21-2. Use LINQ to SQL, but not the Object Relational Designer, to retrieve all the orders from the Order Details table where the quantity ordered is greater than 100. (You ll have to use a short type for the quantity, or else you ll get an error.) Exercise 21-3. Using the Object Relational Designer, find out which employees (first and last names) have serviced orders placed by the customer named Ernst Handel.
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Appendix
APPENDIX
Answers to Quizzes and Exercises
1: C# and .NET Programming
Quiz Solutions
Solution to Question 1-1. The Common Language Runtime (CLR) is the component of the .NET Framework that allows you to compile and execute applications written in either C# or Visual Basic .NET. Solution to Question 1-2. The .NET Framework specifies how .NET constructs intrinsic types, classes, interfaces, and so forth. Solution to Question 1-3. Calling C# a safe language refers to type safety the ability of the compiler to ensure that the objects you create are of the expected type. Solution to Question 1-4. Keywords are reserved for use by the language and cannot be used to identify objects or methods you create. Solution to Question 1-5. The job of the compiler is to turn your source code into Microsoft Intermediate Language (MSIL). Solution to Question 1-6. The Microsoft Intermediate Language is the native language for .NET and is compiled into an executable application by the Just In Time (JIT) compiler. Solution to Question 1-7. The Just In Time compiler turns your MSIL code into an application in memory.
Solution to Question 1-8. Namespaces are used to ensure that identifiers are unique across libraries of classes. In other words, they ensure that a name that you use in your code doesn t conflict with a name used by Microsoft, or anybody else. Solution to Question 1-9. A string is a class with many abilities and uses, but in its simplest form, a string is text enclosed in double quotation marks. Solution to Question 1-10. The four kinds of applications you can build with Visual Studio 2008 are Console, Windows, Web, and Web Services applications.
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