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Figure 1-12. Windows form with a Button control Double-click the Click Me button to go into its Click event handler. Type in the code shown in Listing 1-7. Listing 1-7. Click Event Handler of the Button Control private void button1_Click(object sender, EventArgs e) { MessageBox.Show("Hello from Windows Forms"); } The code shows the Click event handler of the Button control. Notice the signature of the event handler carefully. Throughout the .NET Framework, Microsoft has maintained a uniform signature for event handlers. The first parameter of the event handler gives you the reference of the control (or object in general) that raised the event. The second parameter (often referred to as event arguments) supplies more information about the event, if any. The second parameter can be either an instance of the EventArgs class directly or of any other class inheriting from the EventArgs class.

Summary

You probably heard about 2D coordinate systems in geometry class. Just to remind you, Figure 2-1 represents a triangle, expressed by each of its vertices, in a 2D coordinate system. Analyze the vertices coordinates to make sure you understand the concept.

can act as an event handler for multiple controls. For example, you can handle the Click event of two Button controls by writing just one event handler function. In such cases, the sender parameter can be used to identify the control that raised the event.

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You learned in this chapter how to set up Ubuntu Server. Because the file system layout is a very important part of a server configuration, special attention was paid to configuring your server s file system with LVM or traditional partitions. At the end of this chapter, you ended up with a text-based console that s not so user friendly. In 2, you will learn to work with the most important commands needed for Linux server administration.

When you double-click a control, Visual Studio automatically takes you to its default event handler. However, you can wire various events and their handlers manually by using properties windows. Figure 1-13 shows how this is done.

operator ${1#/} removes the first / in $1 only if the value of $1 starts with a / However, if there s anything before the /, the operator will not know what to do These examples showed how a pattern-matching operator is used to start searching from the beginning of a string You can start searching from the end of the string as well To do so, a % is used instead of a # This % refers to the shortest match of the pattern, and %% refers to its longest match The script in Listing 7-15 shows how this works Listing 7-15.

Figure 2-1. A triangle in a 2D coordinate system The main difference between the coordinate system presented in Figure 2-1 and the coordinates used when creating a 2D game called screen coordinates is that the axis origin is not at the bottom left. Instead, the axis origin is located in the top-left position, as depicted in Figure 2-2. Compare Figures 2-1 and 2-2 to understand how this difference impacts the vertices definition: the higher a vertex appears on the screen, the lower its y-axis coordinates.

Using Pattern-Matching Operators to Start Searching at the End of a String #!/bin/bash # # script that isolates the directory name from a complete file name # usage: stripdir <complete file name> dirname=${1%%/*} echo "The directory name is $dirname" While executing, you ll see that this script has a problem: sander@linux %> /stripdir /bin/bash The directory name is As you can see, the script does its work somewhat too enthusiastically and removes everything Fortunately, this problem can be solved by first using a pattern-matching operator that removes the / from the start of the complete file name (but only if that / is provided) and then removing everything following the first / in the complete file name The example in Listing 7-16 shows how this is done Listing 7-16.

Figure 1-13. Wiring events and their handlers manually Inside the event handler, we have used the MessageBox class to display a message box. The Show() method of the MessageBox class has many overloads. We have used the one that accepts a message to be displayed to the user. Now, use the Build menu to compile the application. Compiling the application will create an executable .NET assembly. Though you can run the .exe directly, you may prefer to run the application via the Visual Studio IDE so that you can debug it if required. To run the application, choose Debug Start Debugging from the menu. Figure 1-14 shows a sample run of the application.

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