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TO WIRE THE CLICK ACTION TO A BUTTON
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1. Close the running application, and return to the IDE. Double-click the button control. You ll see the code window shown in Figure 4-3.
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58 Microsoft Visual C# 2008 Express Edition: Build a Program Now!
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If you try to type some code and it doesn t work, your application is probably still running. If you don t close the application and you return to Visual C#, you won t be able to modify the source code. A good way to verify that you have closed and terminated the application is to look in the Visual C# Express Edition title bar. If you see the name of your application followed by the word (running), this means your application is still active and you won t be able to add code. If you try to add code, the status bar will report that you are in read-only mode with the following message: Cannot currently modify this text in the editor. It is in read-only.
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Figure 4-3 Code window for the btnGo_Click event
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If you terminated the execution of your application properly, you should see the source code window with the btnGo_Click event template. When you double-clicked the button control, you signaled to Visual Studio that you wanted to wire the click action to the button control. Typically, each control can trigger multiple events depending on which behavior you want to intercept with your code. Each control has a default event that becomes available to the programmer for coding by double-clicking the control on the designer surface. In this case, Visual Studio created the Click event template so that you could enter the following code. 2. Type the following code at the cursor:
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myBrowser.Navigate(tbURL.Text);
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Everything in C# is case-sensitive, so tbURL and tbUrl are two different values.
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3. Press F5 to compile and execute the application. If you named your controls correctly in step 8 in the previous exercise and entered the line of code as shown in step 2 of this exercise, you should now have your own Web browser application that takes you to a Web page when you enter a URL. Of course, you won t have all the bells and whistles of Internet Explorer, but be patient we re getting there. Try going to your favorite URLs to see whether your browser is working as expected. For instance, I went to www.microsoft. com, and it worked just fine! You can see the result in Figure 4-4.
4: Creating Your Own Web Browser in Less Than Five Minutes
Figure 4-4 MyOwnBrowser showing the Microsoft.com Web site
Putting It All Together
MORE INFO
Philosophies differ when it comes to naming the variable that represents controls on the design surface. In this book, I ll use up to three letters to describe and identify the control type by looking at its name, such as btn for a button control. The variable name then becomes btnGo. I will introduce the list when I talk about common controls in 5, Using Rapid Application Development Tools with Visual C# 2008.
You ve just seen that when you drag a control to the design surface, you re actually creating an object of that control class. When you re naming the control in the Properties window, you re actually assigning a name to the variable you ve just created which is exactly what you did for the three controls used in your browser. In fact, this is why you want to give your controls meaningful names so that you can use them later programmatically. As you now know, a great deal of activity was taking place when you dropped controls on the designer surface. To help you understand what took place in the background, we talked about important OOP concepts behind the line of code you added to respond to the Click event.
Microsoft Visual C# 2008 Express Edition: Build a Program Now!
Now that you ve run the application, here is a list of questions you may have: What happens if I put nothing in the text box and hit Enter What happens if I enter an invalid URL What happens if I enter anything I want My answer to you is simply, Try it. Try it now. The real deal is that your Web browser will actually behave like any other Web browser and will navigate to whatever URL is typed into the text box. If you don t type anything, clicking the GO button will have no effect. If you type something that isn t a URL, the browser control will come back with a Page Not Found or Code 404 page. Now is your time to experiment. Remember this book s rule: try, try, try. Play with it. Change some of the properties, and see the results at run time. Although we haven t used many features yet, you ll add more in 6. This project is far from over! By adding new features, you ll arrive at a point where your application will start to look much more familiar.
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