C# 5.0 Programmer's Reference

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178 ❘ CHAPTER 8 LINQ For example, the following query selects customer first and last names concatenated into a single string. The result is a string, so the query’s IEnumerable result contains strings and the foreach loop can treat them as strings. var query = from customer in customers select customer.FirstName + " " + customer.LastName; foreach (string name in query) Console.WriteLine(name); Often the select clause picks some sort of object. The following query selects the Customer objects contained in the customers array. The result contains Customer objects, so the code can use an explicitly typed Customer for its looping variable. var query = from customer in customers select customer; foreach (Customer customer in query) Console.WriteLine(customer.FirstName + " " + customer.LastName); Advanced LINQ Query Syntax join So far this chapter has described basic LINQ commands that you might expect to use regularly, but there’s much more to LINQ than these simple queries. The following sections describe some of the more advanced LINQ commands that are less intuitive and that you probably won’t need to use as often. The join keyword selects data from multiple data sources matching up corresponding fields. The following pseudocode shows the join clause’s syntax: from variable1 in dataSource1 join variable2 in dataSource2 on variable1.field1 equals variable2.field2 For example, the following query selects Customer objects from the customers array. For each Customer object, it selects Order objects from the orders array where the two records have the same CustomerId value. var query = from customer in customers join order in orders on customer.CustomerId equals order.CustomerId select new { customer, order }; www.it-ebooks.info
Advanced LINQ Query Syntax ❘ 179 Finicky Joins The syntax for the join clause is fairly finicky. The on portion must list the “from” variable first and the “join” variable second. It must also include the equals keyword and you cannot include other operators such as ==,
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C# 5.0 PROGRAMMER’S REFERENCE Int
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Appendix V XML. ...................
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C# 5.0 Programmer’s Reference www
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C# 5.0 Programmer’s Reference Rod
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About the Author Rod Stephens start
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Credits Executive Editor Robert Ell
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Acknowledgments Thanks to Bob Ellio
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CONtents Introduction xxxiii PARt I
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CONTENTS Properties 86 Enumerations
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CONTENTS Set Methods 182 Limiting R
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CONTENTS Hiding and Overriding Even
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CONTENTS Resource Files 405 Applica
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CONTENTS Tasks 496 Threads 498 Coor
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CONTENTS Chapter 3 627 Chapter 4 62
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CONTENTS Appendix i: Error Handling
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CONTENTS Appendix s: Filesystem Cla
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Introduction When it comes to progr
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INTRODUCTION This book focuses on t
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INTRODUCTION Part V: Advanced Topic
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INTRODUCTION Source Code As you wor
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INTRODUCTION After you join, you ca
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Part I The C# Ecosystem ▶▶Chapt
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1The C# Environment What’s in Thi
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The C# Compiler ❘ 5 Consider the
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The CLR ❘ 7 C# Program Visual Bas
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Summary ❘ 9 By using all of these
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2Writing a First Program What’s i
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Types of Projects ❘ 13 TIP For a
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Console Applications ❘ 15 Another
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Windows Forms Applications ❘ 17 T
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WPF Applications ❘ 19 If you skip
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Windows Store Applications ❘ 21 A
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Summary ❘ 23 } // Place the frame
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Exercises ❘ 25 6. Repeat Exercise
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3Program and Code File Structure Wh
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Hidden Files ❘ 29 Figure 3-2: A p
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Preprocessor Directives ❘ 31 The
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Code File Structure ❘ 37 { ... }
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Code File Structure ❘ 39 Unnecess
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Code File Structure ❘ 41 } namesp
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Comments ❘ 43 Comments Comments c
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Comments ❘ 45 XML Comments A norm
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Comments ❘ 47 WindowsFormsApplica
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Exercises ❘ 49 4. Open Project
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Part II C# Language Elements ▶▶
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4Data Types, Variables, and Constan
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Data Types ❘ 55 C# also groups by
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Data Types ❘ 57 Alignment Attribu
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Variable Declaration Syntax ❘ 59
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Initialization ❘ 65 } public Car(
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Initialization ❘ 67 Now the progr
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Literal Type Characters ❘ 69 NOTE
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Literal Type Characters ❘ 71 C# a
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Data Type Conversion ❘ 73 The fol
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Data Type Conversion ❘ 75 You can
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Data Type Conversion ❘ 77 This is
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Scope ❘ 79 ToString The ToString
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Scope ❘ 81 Class Scope A variable
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Parameter Declarations ❘ 83 Becau
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Parameter Declarations ❘ 85 Becau
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Properties ❘ 87 Properties also e
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Enumerations ❘ 89 The syntax for
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Enumerations ❘ 91 The following c
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Delegates ❘ 93 To determine wheth
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Summary ❘ 95 For a more interesti
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Exercises ❘ 97 14. Make two metho
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5Operators What’s in This Chapter
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Arithmetic Operators ❘ 101 The +
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Logical Operators ❘ 103 operator
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Bitwise Operators ❘ 105 Because &
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Assignment Operators ❘ 107 Format
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Operator Precedence ❘ 109 Operato
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DateTime and TimeSpan Operations
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Operator Overloading ❘ 113 The fo
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Operator Overloading ❘ 115 curren
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Summary ❘ 117 In this case it may
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Exercises ❘ 119 11. Before each o
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6Methods What’s in This Chapter
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Method Declarations ❘ 123 See the
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Method Declarations ❘ 125 Now sup
Page 171 and 172: Method Declarations ❘ 127 } Stree
Page 173 and 174: Method Declarations ❘ 129 If the
Page 175 and 176: Method Declarations ❘ 131 The fol
Page 177 and 178: Method Declarations ❘ 133 "RodSte
Page 179 and 180: Extension Methods ❘ 135 Explicit
Page 181 and 182: Lambda Expressions ❘ 137 takes no
Page 183 and 184: Variance ❘ 139 Variance Suppose t
Page 185 and 186: Asynchronous Methods ❘ 141 This m
Page 187 and 188: Asynchronous Methods ❘ 143 Next,
Page 189 and 190: Asynchronous Methods ❘ 145 callba
Page 191 and 192: Exercises ❘ 147 The chapters so f
Page 193 and 194: Exercises ❘ 149 The File menu has
Page 195 and 196: 7Program Control Statements What’
Page 197 and 198: Decision Statements ❘ 153 If it
Page 199 and 200: Decision Statements ❘ 155 } break
Page 201 and 202: Looping Statements ❘ 157 To catch
Page 203 and 204: Looping Statements ❘ 159 Out of C
Page 205 and 206: Looping Statements ❘ 161 do Loops
Page 207 and 208: Looping Statements ❘ 163 One appr
Page 209 and 210: Looping Statements ❘ 165 break St
Page 211 and 212: Exercises ❘ 167 else if (person.T
Page 213 and 214: 8LINQ What’s in This Chapter ➤
Page 215 and 216: Introduction to LINQ ❘ 171 ➤➤
Page 217 and 218: Basic LINQ Query Syntax ❘ 173 Bas
Page 219 and 220: Basic LINQ Query Syntax ❘ 175 whe
Page 221: Basic LINQ Query Syntax ❘ 177 sel
Page 225 and 226: Advanced LINQ Query Syntax ❘ 181
Page 227 and 228: Advanced LINQ Query Syntax ❘ 183
Page 229 and 230: LINQ Extension Methods ❘ 185 Intr
Page 231 and 232: LINQ Extension Methods ❘ 187 } };
Page 233 and 234: LINQ to XML ❘ 189 } } // Return t
Page 235 and 236: LINQ to XML ❘ 191 LINQ into XML L
Page 237 and 238: LINQ to XML ❘ 193 the code uses t
Page 239 and 240: LINQ to ADO.NET ❘ 195 more inform
Page 241 and 242: LINQ to ADO.NET ❘ 197 ID, first a
Page 243 and 244: PLINQ ❘ 199 download on the book
Page 245 and 246: Exercises ❘ 201 how you can prote
Page 247 and 248: Exercises ❘ 203 9. Copy the progr
Page 249 and 250: 9Error Handling What’s in This Ch
Page 251 and 252: Bugs Versus Undesirable Conditions
Page 265 and 266: try catch Blocks ❘ 221 catch (exc
Page 267 and 268: try catch Blocks ❘ 223 When the f
Page 269 and 270: try catch Blocks ❘ 225 other exce
Page 271 and 272: try catch Blocks ❘ 227 In that ca
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Exercises ❘ 229 Summary In practi
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10 Tracing and Debugging What’s i
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The Debug Menu ❘ 233 ➤➤ ➤
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The Breakpoints Window ❘ 235 ➤
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The Immediate Window ❘ 237 Right-
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Trace Listeners ❘ 239 Debug.Liste
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Exercises ❘ 241 The chapters in P
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Part III Object-Oriented Programmin
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11 OOP Concepts What’s in This Ch
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Classes ❘ 247 Method AssignJob Pr
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Encapsulation ❘ 249 Private Prope
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Inheritance ❘ 251 For example, su
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Inheritance ❘ 253 you may discove
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Inheritance ❘ 255 The solution is
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Inheritance ❘ 257 Has-a and Is-a
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Inheritance ❘ 259 This method req
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Inheritance ❘ 261 Ann: Person.Hid
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Polymorphism ❘ 263 } } return "Eu
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Polymorphism ❘ 265 version define
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Exercises ❘ 267 Rewrite the code
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12 Classes and Structures What’s
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Classes ❘ 271 For more informatio
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Classes ❘ 273 Extension Tension Y
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Structures ❘ 275 The class automa
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Structures ❘ 277 Heap and Stack P
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Structures ❘ 279 The parameter ad
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Structures ❘ 281 Argument Type Pa
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Constructors ❘ 283 You can overlo
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Structure Instantiation Details ❘
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Garbage Collection ❘ 287 Note tha
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Garbage Collection ❘ 289 ➤➤
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Events ❘ 291 The following list d
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Events ❘ 293 The EventHandler typ
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Events ❘ 295 } MessageBoxButtons.
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Events ❘ 297 The solution is to g
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Static Methods ❘ 299 This kind of
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Exercises ❘ 301 Exercises 1. Draw
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13 Namespaces What’s in This Chap
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The using Directive ❘ 305 The Sys
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The using Directive ❘ 307 Sometim
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The using Directive ❘ 309 Now whe
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Making Namespaces ❘ 311 The Defau
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Resolving Namespaces ❘ 313 Resolv
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Exercises ❘ 315 private ConsoleTy
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14 Collection Classes What’s in T
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Arrays ❘ 319 Array objects can ha
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System.Collections ❘ 321 Property
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System.Collections ❘ 323 Why Both
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System.Collections ❘ 325 The code
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Dictionaries ❘ 327 The System.Col
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Dictionaries ❘ 329 One overloaded
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Stacks and Queues ❘ 331 } } jobsL
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Stacks and Queues ❘ 333 Console.W
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Generic Collections ❘ 335 Notice
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Collection Initializers ❘ 337 Sta
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Summary ❘ 339 } } // If this numb
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Exercises ❘ 341 e. Finally, to pu
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15 Generics What’s in This Chapte
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Defining Generics ❘ 345 Suppose y
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Defining Generics ❘ 347 } public
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Defining Generics ❘ 349 For examp
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Defining Generics ❘ 351 A generic
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Generics and Extension Methods ❘
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Exercises ❘ 355 The chapters in t
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Part IV Interacting with the Enviro
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16 Printing What’s in This Chapte
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Windows Forms Printing ❘ 361 ➤
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Windows Forms Printing ❘ 363 // S
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Windows Forms Printing ❘ 365 The
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Windows Forms Printing ❘ 367 Simi
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Windows Forms Printing ❘ 369 Prop
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Windows Forms Printing ❘ 371 } }
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Windows Forms Printing ❘ 377 Page
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Windows Forms Printing ❘ 379 that
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WPF Printing ❘ 381 Using a Pagina
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WPF Printing ❘ 383 // This exampl
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WPF Printing ❘ 385 } grid.Childre
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WPF Printing ❘ 387 Consectetur
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WPF Printing ❘ 389 To display a F
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Exercises ❘ 391 // Calculate the
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17 Configuration and Resources What
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Environment Variables ❘ 395 To se
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Registry ❘ 397 Method ExpandEnvir
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Registry ❘ 399 Field LocalMachine
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Registry ❘ 401 The following code
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Configuration Files ❘ 403 Figure
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Resource Files ❘ 405 Second, the
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Resource Files ❘ 407 Localization
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Exercises ❘ 409 2. Write a progra
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18 Streams What’s in This Chapter
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Stream ❘ 413 Property Length Posi
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MemoryStream ❘ 415 This code gets
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BinaryReader and BinaryWriter ❘ 4
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StringReader and StringWriter ❘ 4
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StreamReader and StreamWriter ❘ 4
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Summary ❘ 423 Custom Stream Class
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19 File System Objects What’s in
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.NET Framework Classes ❘ 427 Meth
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.NET Framework Classes ❘ 431 Prop
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Using the Recycle Bin ❘ 439 The f
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Using the Recycle Bin ❘ 441 More
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Summary ❘ 443 The code creates a
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20 Networking What’s in This Chap
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Networking Classes ❘ 447 The WebR
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Downloading Information ❘ 449 Dow
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Downloading Information ❘ 451 Fig
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Downloading Information ❘ 453 The
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Uploading Information ❘ 455 Uploa
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Getting FTP Information ❘ 457 3.
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Sending E‐mail ❘ 459 ➤➤ ➤
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Sending Text Messages ❘ 461 For e
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Exercises ❘ 463 TERm IP (Internet
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Exercises ❘ 465 14. Modify the pr
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Part V Advanced Topics ▶▶Chapte
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21 Regular Expressions What’s in
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Building Regular Expressions ❘ 47
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Using Regular Expressions ❘ 479 M
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Using Regular Expressions ❘ 481 }
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Exercises ❘ 483 For each match, t
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22 Parallel Programming What’s in
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Parallel Programming ❘ 487 Multip
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Interacting with the User Interface
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BackgroundWorker ❘ 491 The follow
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BackgroundWorker ❘ 493 This isn
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BackgroundWorker ❘ 495 for (int i
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Tasks ❘ 497 Method WaitAny WhenAl
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Coordinating Tasks ❘ 499 Creating
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Coordinating Tasks ❘ 501 } if (my
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Thread-Safe Objects ❘ 503 Other L
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Exercises ❘ 505 the BackgroundWor
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Exercises ❘ 507 The following tex
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23 ADO.NET What’s in This Chapter
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Using Bound Controls ❘ 511 free.
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Using Bound Controls ❘ 513 4. The
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Using Bound Controls ❘ 515 If you
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Using Bound Controls ❘ 517 Figure
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Using Bound Controls ❘ 519 b. In
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Using Bound Controls ❘ 521 tools
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Using Bound Controls ❘ 523 6. Cre
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Loading DataSets ❘ 525 Loading Da
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Using ADO.NET ❘ 527 } studentsDat
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Using ADO.NET ❘ 529 Executing Com
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Exercises ❘ 531 Exercises 1. Writ
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24 XML What’s in This Chapter ➤
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Basic XML Syntax ❘ 535 Elements m
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Basic XML Syntax ❘ 537 Character
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Writing XML Data ❘ 539 Method Wri
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Writing XML Data ❘ 541 The follow
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Writing XML Data ❘ 543 // Save th
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Writing XML Data ❘ 545 The follow
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Reading XML Data ❘ 547 XML Litera
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Reading XML Data ❘ 549 Method Rea
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Related Technologies ❘ 551 The Re
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Related Technologies ❘ 553 Operat
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Related Technologies ❘ 555 This q
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Related Technologies ❘ 557 The bo
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Exercises ❘ 559 Figure 24-5: The
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Exercises ❘ 561 3. Write a progra
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25 Serialization What’s in This C
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XML Serialization ❘ 565 The Seria
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XML Serialization ❘ 567 // Create
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XML Serialization ❘ 569 Each Orde
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XML Serialization ❘ 571 In the Or
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JSON Serialization ❘ 573 The Data
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JSON Serialization ❘ 575 To deser
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Binary Serialization ❘ 577 Ignore
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Exercises ❘ 579 4. The XmlSeriali
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26 Reflection What’s in This Chap
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Learning About Classes ❘ 583 Cust
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Getting and Setting Properties ❘
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Getting and Setting Properties ❘
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Getting Assembly Information ❘ 58
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Invoking Methods ❘ 591 The follow
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Running Scripts ❘ 593 The program
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Running Scripts ❘ 595 // Generate
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Exercises ❘ 597 Summary Most prog
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Exercises ❘ 599 ➤➤ ➤➤ For
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27 Cryptography What’s in This Ch
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Randomness ❘ 603 through the slot
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Randomness ❘ 605 A 32-bit integer
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Randomness ❘ 607 The program then
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Symmetric Key Encryption ❘ 609 //
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Symmetric Key Encryption ❘ 611 {
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Symmetric Key Encryption ❘ 613 Ho
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Asymmetric Key Encryption ❘ 615 n
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Asymmetric Key Encryption ❘ 617 T
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Exercises ❘ 619 Length Limitation
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Exercises ❘ 621 6. The RandomNumb
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Part VI Appendices ▶▶Appendix A
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ASolutions to Exercises All the pro
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Chapter 3 ❘ 627 When you run the
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Chapter 4 ❘ 629 // Code Block 2 .
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Chapter 5 ❘ 631 } } } // Get and
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Chapter 5 ❘ 633 } }; } public sta
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Chapter 6 ❘ 635 12. The following
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Chapter 6 ❘ 637 The following cod
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Chapter 7 ❘ 639 } case 4: birthst
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Chapter 7 ❘ 641 total += values[i
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Chapter 8 ❘ 643 After selecting t
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Chapter 8 ❘ 645 The query orders
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Chapter 8 ❘ 647 10. Example progr
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Chapter 9 ❘ 649 } get { return _N
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Chapter 9 ❘ 651 In this version,
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Chapter 9 ❘ 653 } } Console.Write
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Chapter 10 ❘ 655 The button’s e
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Chapter 10 ❘ 657 An obvious advan
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Chapter 11 ❘ 659 Chapter 11 1. Yo
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Chapter 11 ❘ 661 5. The “is-a
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Chapter 11 ❘ 663 Person Name Addr
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Chapter 12 ❘ 665 Chapter 12 The e
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Chapter 13 ❘ 667 Chapter 13 1. Fi
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Chapter 14 ❘ 669 } string text =
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Chapter 14 ❘ 671 When the user cl
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Chapter 15 ❘ 673 8. The ListAllPr
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Chapter 15 ❘ 675 2. The Increasin
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Chapter 15 ❘ 677 This code create
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Chapter 16 ❘ 679 } { case 1: Draw
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Chapter 16 ❘ 681 // Make the font
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Chapter 17 ❘ 683 } lst.Items.Add(
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Chapter 18 ❘ 685 The following te
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Chapter 18 ❘ 687 } // Save the te
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Chapter 19 ❘ 689 { // Create an a
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Chapter 19 ❘ 691 private void For
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Chapter 19 ❘ 693 8. The ShowGrand
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Chapter 20 ❘ 695 client.DownloadS
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Chapter 20 ❘ 697 } // Request the
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Chapter 20 ❘ 699 10. The UploadSt
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Chapter 20 ❘ 701 14. The FtpListD
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Chapter 21 ❘ 703 } // Display the
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Chapter 21 ❘ 705 7. The following
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Chapter 22 ❘ 707 3. The FiboTasks
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Chapter 22 ❘ 709 The DeadUnlock e
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Chapter 23 ❘ 711 Chapter 23 1. Th
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Chapter 24 ❘ 713 Chapter 24 1. Th
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Chapter 24 ❘ 715 // Display plant
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Chapter 24 ❘ 717 The code then so
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Chapter 24 ❘ 719 T
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Chapter 25 ❘ 721 This code is rea
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Chapter 25 ❘ 723 [XmlIgnore] publ
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Chapter 26 ❘ 725 } } foreach (obj
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Chapter 26 ❘ 727 The following co
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Chapter 27 ❘ 729 is decrypting, t
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Chapter 27 ❘ 731 11. The EncryptW
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BData Types The following table sum
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Casting and Converting Values ❘ 7
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CVariable Declarations The followin
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Enumerated Type Declarations ❘ 73
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DConstant Declarations Constant dec
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EOperators The C# operators fall in
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Operator Precedence ❘ 745 Bitwise
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DateTime and TimeSpan Operators ❘
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FMethod Declarations This appendix
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Extension Methods ❘ 751 An async
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GUseful Attributes The .NET Framewo
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Other Useful Attributes ❘ 755 Oth
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HControl Statements Control stateme
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Looping Statements ❘ 759 Here:
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IError Handling A program can use t
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J LINQ This appendix provides synta
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Basic LINQ Query Syntax ❘ 765 joi
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LINQ Functions ❘ 767 LINQ Functio
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LINQ to XML ❘ 769 LINQ out of XML
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PLINQ ❘ 771 The following list su
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KClasses and Structures This append
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Events ❘ 775 To create a destruct
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LCollection Classes This appendix p
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Collections ❘ 779 Collections Col
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Iterators ❘ 781 }; } for (int i =
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MGeneric Declarations This appendix
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NPrinting and Graphics This appendi
Page 831 and 832:
Windows Forms Printing ❘ 787 ➤
Page 833 and 834:
Page 835 and 836:
Page 837 and 838:
Windows Forms Printing ❘ 793 Stri
Page 839 and 840:
WPF Printing ❘ 795 Method LockBit
Page 841 and 842:
WPF Printing ❘ 797 Nullam dapibu
Page 843 and 844:
OUseful Exception Classes When your
Page 845 and 846:
Standard Exception Classes ❘ 801
Page 847 and 848:
PDate and Time Format Specifiers A
Page 849 and 850:
Custom Format Specifiers ❘ 805 Sp
Page 851 and 852:
Q Other Format Specifiers A program
Page 853 and 854:
Numeric Formatting Sections ❘ 809
Page 855 and 856:
Enumerated Type Formatting ❘ 811
Page 857 and 858:
RStreams The .NET Framework provide
Page 859 and 860:
BinaryReader and BinaryWriter ❘ 8
Page 861 and 862:
TextReader and TextWriter ❘ 817 M
Page 863 and 864:
Text File Stream Methods ❘ 819 Me
Page 865 and 866:
SFilesystem Classes This appendix d
Page 867 and 868:
Framework Classes ❘ 823 File The
Page 869 and 870:
Framework Classes ❘ 825 DriveInfo
Page 871 and 872:
Framework Classes ❘ 827 Property
Page 873 and 874:
Page 875 and 876:
Page 877 and 878:
Recycle Bin ❘ 833 FileIO.FileSyst
Page 879 and 880:
TRegular Expressions This appendix
Page 881 and 882:
Regular Expression Options ❘ 837
Page 883 and 884:
Using Regular Expressions ❘ 839 S
Page 885 and 886:
Using Regular Expressions ❘ 841 T
Page 887 and 888:
UParallel Programming This appendix
Page 889 and 890:
Tasks ❘ 845 Parallel.For The Para
Page 891 and 892:
Threads ❘ 847 ➤➤ ➤➤ Call
Page 893 and 894:
VXML This appendix summarizes usefu
Page 895 and 896:
Writing XML Data ❘ 851 Document O
Page 897 and 898:
Writing XML Data ❘ 853 Method Des
Page 899 and 900:
Reading XML Data ❘ 855 Property A
Page 901 and 902:
Related Technologies ❘ 857 ➤➤
Page 903 and 904:
WSerialization This appendix summar
Page 905 and 906:
JSON Serialization ❘ 861 Attribut
Page 907 and 908:
Binary Serialization ❘ 863 Binary
Page 909 and 910:
XReflection A class’s type provid
Page 911 and 912:
Type ❘ 867 Property IsValueType I
Page 913 and 914:
Type ❘ 869 Method GetNestedType G
Page 915 and 916:
MethodInfo ❘ 871 Method AddEventH
Page 917 and 918:
FieldInfo ❘ 873 FieldInfo A Field
Page 919 and 920:
ParameterInfo ❘ 875 Property Defa
Page 921 and 922:
Index Symbols + (addition) operator
Page 923 and 924:
attributes - Bitmap class Flags, 75
Page 925 and 926:
Class View - classes Class View, 31
Page 927 and 928:
CollectionDataContract attribute -
Page 929 and 930:
data types - Debug menu data types,
Page 931 and 932:
delegate keyword - DownloadFileTask
Page 933 and 934:
#endif directive - exception classe
Page 935 and 936:
FileInfo class - FirstOrDefault met
Page 937 and 938:
global namespace - inheritance glob
Page 939 and 940:
lambda expressions - LINQ L lambda
Page 941 and 942:
memory - methods, ConvertAll memory
Page 943 and 944:
methods, GetResponseStream - method
Page 945 and 946:
NameValueCollection class - operato
Page 947 and 948:
ParameterInfo class - precedence of
Page 949 and 950:
properties, FieldInfo class - prope
Page 951 and 952:
protected internal keyword - #regio
Page 953 and 954:
Serialize method - statements XML,
Page 955 and 956:
StringWriter class - Task class Str
Page 957 and 958:
TryEnter method - Type class TryEnt
Page 959 and 960:
virtual keyword - XDocument class v
Page 961 and 962:
XmlArray attribute - XSLT SOAP (Sim
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C# 5.0 Programmer's Reference

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