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xiv■CONTENTSSelecting Data from a Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 406Deleting Data from the Database . . . . . . . . . . . . . . . . . . . . . . . . . . . . 406Closing a Database Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 407Recapping ADO.NET Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 407Using the Dataset Designer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 408Building Relations Between Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . 408Using the Generated Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 412The Important Stuff to Remember . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 414Some Things for You to Do. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 414■CHAPTER 15 Learning About LINQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 415Finding the Frequency of Winning Numbers . . . . . . . . . . . . . . . . . . . . . . . . 415Extending the Lottery-Prediction System . . . . . . . . . . . . . . . . . . . . . 416Implementing a Frequency Solution . . . . . . . . . . . . . . . . . . . . . . . . . . 419Learning More LINQ Tricks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 425Selecting and Altering Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 428Selecting with Anonymous Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . 430Processing Multiple Streams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 431Sorting the Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 431Splitting Results into Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 433Performing Set Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 434Using LINQ in Other Contexts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 436The Important Stuff to Remember . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 438Some Things for You to Do. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 438■CHAPTER 16 Writing Functional Code in C#. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439Why Functional Programming? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439The Essence of Functional Programming . . . . . . . . . . . . . . . . . . . . . . . . . . 441Higher-Order Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 442Pure Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 445Function Evaluation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 450Recursion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 452The Important Stuff to Remember . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 453Some Things for You to Do. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 453
■CONTENTSxv■CHAPTER 17 Learning About Other C# Techniques . . . . . . . . . . . . . . . . . . . . . 455Operators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 455Using Arithmetic Operators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 455Overloading the Operators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 460The goto Statement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 462.NET Generics Constraints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 463Using the type Constraint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 463Using the new Constraint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 465Using the class Constraint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 465Nullable Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 466Partial Classes and Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 468The Important Stuff to Remember . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 470Some Things for You to Do. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 470■INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 471
Page 1: The EXPERT’s VOIce ® in .NETBegi
Page 5: Some food for thought when writing
Page 9 and 10: ContentsAbout the Author . . . . .
Page 11 and 12: ■CONTENTSixOrganizing the Search
Page 14 and 15: xii■CONTENTSTweaking Serializatio
Page 19: About the AuthorMany people say tha
Page 23: IntroductionThe first computer prog
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CHAPTER 3■ ■ ■Learning About
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CHAPTER 3 ■ LEARNING ABOUT STRING
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78CHAPTER 4 ■ LEARNING ABOUT DATA
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CHAPTER 5 ■ LEARNING ABOUT C# EXC
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CHAPTER 6■ ■ ■Learning the Ba
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CHAPTER 6 ■ LEARNING THE BASICS O
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CHAPTER 9 ■ LEARNING ABOUT LISTS,
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CHAPTER 14 ■ LEARNING ABOUT RELAT
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CHAPTER 15 ■ LEARNING ABOUT LINQ
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CHAPTER 16■ ■ ■Writing Functi
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CHAPTER 16 ■ WRITING FUNCTIONAL C
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472■INDEXincrement, 458-459modulu
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474■INDEXconfiguration files, 336
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476■INDEXdouble value, 325Double.
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478■INDEXIExample interface, 169#
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482■INDEXusing consoles, 258-278b
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484■INDEXSQL (Structured Query La
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486■INDEXTranslateWord( ) method,
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