On the Build menu, click Build Solution. Correct any errors that occur. in .NET framework

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3. On the Build menu, click Build Solution. Correct any errors that occur.
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Run the application
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1. On the Debug menu, click Start Without Debugging. 2. Type your name and phone number in the text boxes, and then click Add. When you click the Add button, the Add method stores the information in the phone book and clears the text boxes so that they are ready to perform a search. 3. Repeat step 2 several times with some different names and phone numbers so that the phone book contains a selection of entries. Note The application performs no checking of the names and telephone numbers
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that you enter, and you can input the same name and telephone number more than once. To avoid confusion, please make sure that you provide different names and telephone numbers.
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4. Type a name that you used in step 2 into the Name text box, and then click Search by Name. The phone number you added for this contact in step 2 is retrieved from the phone book and is displayed in the Phone Number text box.
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Part III
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Creating Components
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5. Type a phone number for a different contact in the Phone Number text box, and then click Search by Phone. The contact name is retrieved from the phone book and is displayed in the Name text box. 6. Type a name that you did not enter in the phone book into the Name text box, and then click Search by Name. This time the Phone Number text box is empty, indicating that the name could not be found in the phone book. 7. Close the form, and return to Visual Studio 2008. If you want to continue to the next chapter: Keep Visual Studio 2008 running, and turn to 17. If you want to exit Visual Studio 2008 now: On the File menu, click Exit. If you see a Save dialog box, click Yes (if you are using Visual Studio 2008) or Save (if you are using Visual C# 2008 Express Edition) and save the project.
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16 Quick Reference
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Create an indexer for a class or structure
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Do this
Declare the type of the indexer, followed by the keyword this and then the indexer arguments in square brackets. The body of the indexer can contain a get and/or set accessor. For example:
struct RawInt { ... public bool this [ int index ] { get { ... } set { ... } } ... }
De ne an indexer in an interface
De ne an indexer with the get and/or set keywords. For example:
interface IRawInt { bool this [ int index ] { get; }
set; }
16
Using Indexers
Implement an interface indexer in a class or structure
In the class or structure that implements the interface, de ne the indexer and implement the accessors. For example:
struct RawInt : IRawInt { ... public bool this [ int index { get { ... } set { ... } } ... }
Implement an interface indexer by using explicit interface implementation in a class or structure
In the class or structure that implements the interface, explicitly name the interface, but do not specify the indexer accessibility. For example:
struct RawInt : IRawInt { ... bool IRawInt.this [ int index { get { ... } set { ... } } ... }
17
Interrupting Program Flow and Handling Events
After completing this chapter, you will be able to:
Declare a delegate type to create an abstraction of a method signature. Create an instance of a delegate to refer to a speci c method. Call a method through a delegate. De ne a lambda expression to specify the code for a delegate. Declare an event eld. Handle an event by using a delegate. Raise an event. Much of the code you have written in the various exercises in this book has assumed that statements execute sequentially. Although this is a common scenario, you will nd that it is sometimes necessary to interrupt the current ow of execution and perform another, more important, task. When the task has completed, the program can continue where it left off. The classic example of this style of program is the Microsoft Windows Presentation Foundation (WPF) form. A WPF form displays controls such as buttons and text boxes. When you click a button or type text in a text box, you expect the form to respond immediately. The application has to temporarily stop what it is doing and handle your input. This style of operation applies not just to graphical user interfaces but to any application where an operation must be performed urgently shutting down the reactor in a nuclear power plant if it is getting too hot, for example. To handle this type of application, the runtime has to provide two things: a means of indicating that something urgent has happened and a way of indicating the code that should be run when it happens. This is the purpose of events and delegates. We start by looking at delegates.
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