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Solution to Question 18-1. The various widgets on a Windows form are all known as controls. Solution to Question 18-2. To add a Button control to a Windows form in Visual Studio, simply drag the Button from the Toolbox onto the form wherever you want it. Visual Studio takes care of the code to initialize the control. Solution to Question 18-3. To set the properties of a control, click on the control on the form. This causes the control s properties to appear in the Properties window. From the Properties window, you can set a number of available properties for each control. Solution to Question 18-4. Windows is an event-driven environment in that the code initializes forms that wait to respond to user or system actions events rather than running procedurally from start to finish. Solution to Question 18-5. To make a button respond to being clicked, you need to create an event handler to handle the Click event for the button.

Example 9-4

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Solution to Question 18-6. The two ways to create an event handler in Visual Studio are as follows: Go to the Properties window, click on the lightning bolt button to open the events, and then fill in a name or double-click next to the event to let Visual Studio create the name. Double-click on the control to create the default handler with a name provided by Visual Studio. Solution to Question 18-7. When you create an event handler for a control on your form, Visual Studio automatically takes you to the code page of your form. Solution to Question 18-8. The partial keyword indicates that the code page you see in Visual Studio is not the complete class for the form. Visual Studio hides the initialization code for the controls, so you don t need to worry about it. Solution to Question 18-9. Call the Application.Exit( ) method to close the application. Solution to Question 18-10. Recursion is a method that is calling itself (such as calling MethodA( ) from within the body of MethodA( )).

We wish to produce a result table with names and departments for all employees with school age children Given tables based on the employees and their children from Figs 7-6 and 7-7 Employee: RELATION name : age, height, Children : RELATION father, child : age;

Solution to Exercise 18-1. Create a Windows application that displays the word Hello in a label, and has a button that changes the display to Goodbye . This exercise is similar to the Hello World exercise from earlier in the chapter. You ve seen how to add a Label control and a Button control, and how to change their Text and font properties accordingly, so setting up that much is simple. What you need now is an event handler to change the text of the label when the button is clicked. You ve seen how to set the Text property elsewhere in this chapter, so that s not too hard. Here is the event handler for the button:

but with an identical attribute name age We let one tuple variable kid range over the Children relation and another one, emp, identify tuples in the Employee relation

private void button1_Click( object sender, EventArgs e ) { label1.Text = "Goodbye"; }

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SELECT empname, empage FROM Children kid, Employee emp WHERE kidfather = empname kidage >= 6 For each empname all kidfather values will be investigated When there is any match (here once for Gerbil, twice for Hare), the second condition, kidage > 6 is tested Only the tuple Hare 38 ful lls both requirements Since two of Hare s children are older, the tuple will appear twice

Of course, once the text of the label has changed, you can t change it back. You could add an if statement that changes the text from Hello to Goodbye , or vice versa, every time the button is clicked. You can see the full source code solution to Exercise 18-1 on the website for this book, although there isn t much to it. Figure A-5 is a picture of the form.

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