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Run the new program. Click the Load button and you will be prompted to locate a JPEG image file. If you do not have any such files, you can download some sample images from the book s website at www.manning.com/eebrown. Select an image, and it will be loaded into the image window. Figure 1.4 shows a window with a selected image loaded. If you think this image looks a little distorted, you are correct. We ll discuss this point in more detail later in the chapter. As before, let s take a look at our changes in some detail. 1.3.1 Events If you think about it, Windows applications spend a large amount of time doing nothing. In our example, once the window is initialized and controls drawn, the

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application waits for the user to click the Load button This could happen immediately or hours later How an application waits for such user interactions to occur is an important aspect of the environment in which it runs There are really only two possible solutions: either the application has to check for such actions at regular intervals, or the application does nothing and the operating system kicks the program awake whenever such an action occurs Waiting for a user action can be compared to answering the phone Imagine if there were no ringer and you had to pick up your phone and listen for a caller every couple of minutes to see if someone was calling.

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Even ignoring the extra time a caller might have to wait before you happened to pick up the receiver, it would be difficult to perform any other activities because you would constantly have to interrupt your work to check the phone The ringer allows you to ignore the phone until it rings You can fall asleep on the couch while reading this book (not that you would, of course) and rely on the phone to wake you up when someone calls (unless you turn off the ringer, but that is a separate discussion) Similarly, Windows would grind to a halt if applications were actively looking for user actions all the time Instead, applications wait quietly on the screen, and rely on the operating system to notify them when an action requires a response.

This permits other applications to perform tasks such as checking for new email and playing your music CD between the time you run a program and actually do something with it The interval between running the program and using it may only be seconds, but to a computer every fraction of a second counts Internally, the Windows operating system passes messages around for this purpose When the user clicks the Load button, a message occurs that indicates a button has been pressed The ApplicationRun method arranges for the application to wait for such messages in an efficient manner The NET Framework defines such actions as events Events are pre-defined situations that may occur Examples include the user clicking the mouse or typing on the keyboard, or an alarm going off for an internal timer.

Events can also be triggered by external programs, such as a web server receiving a message, or the creation of a new file on disk In C#, the concept of an event is built in, and classes can define events that may occur on instances of that class, and enable such instances to specify functions that receive and process these events While this may seem complicated, the result is simply this: when the user clicks the mouse or types on the keyboard, your program can wake up and do something In our program, we want to do something when the user clicks the Load button The Button class defines an event called Click Our program defines a method called OnLoadClick to handle this event We link these two together by registering our method as an event handler for the Click event..

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btnLoad.Click += new System.EventHandler(this.OnLoadClick);

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If you have actually read this book from the beginning, you will recall that we looked at the Menu class hierarchy in chapter 3 and the StatusBar hierarchy in chapter 4. 3 introduced some of the low-level classes used by Windows Forms, and chapter 4 extended this hierarchy to include the Control class. The Form class is based on additional extensions to enable scrolling and containment. The complete hierarchy is shown in figure 7.1.