The ASPNET Web Page in VS .NET

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The ASPNET Web Page
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4 Release the mouse button and you'll notice that the Toolbox automatically closes
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5 Point to the label on the Design tab Select the right mouse button to display a pop-up menu and then select the Property option to display the Property panel 6 Select the label on the Design tab and then locate the Text property in the Appearance section of the Property panel Enter Hello world! 7 Move the mouse cursor to anywhere on the Design tab and then click the left mouse button "Hello world!" appears on the ASPNET web page (Figure 2-4) You may have to drag the sizing box that appears around the label to resize the label so that the text appears on one line
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That's all you need to do Select the Code tab and you'll see code that Visual Web Developer wrote for you You must admit that dragging and dropping is more convenient that writing the code yourself
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Figure 2-4 Dragging and dropping the label is easier than writing the code yourself
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ASPONET20 Demystified
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Testing Your ASPNET Web Page
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You can test your ASPNET web page by pressing CTRL-FS Visual Web Developer cranks away and opens the web page in your browser (Figure 2-5) Very little can go wrong with the Hello world! web page However, a real-world ASPNET application is more complex than the Hello world! web page and must be thoroughly tested before you release it on your web site In order to thoroughly test your ASPNET application, you'll need to run it using the debugger that comes with Visual Web Developer The debugger is a tool that is used to execute your web page so that you can see what happens when each instruction executes You'll find the debugger by selecting the Debug menu option Don't do this now, because we'll show you how to use the debugger later in this book
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There are still some diehards among us who like to get their hands dirty and write HTML markup code themselves Dragging and dropping is simple for lazy developers If you're one of those hands-on developers, though, then there are a few facts you need to know before you starting writing HTML markup code using Visual Web Developer
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Figure 2-5 Test your ASPNET web page by selecting CTRL-~5
APTER 2
The ASPNET Web Page
Figure 2-6 An error is displayed if you write buggy code
The Source tab of the Visual Web Developer is the place to insert your own HTML markup code into the ASPNET web page Code that you enter here is properly displayed when you switch to the Design tab However, you must make sure that you properly write your code; otherwise, you'll see an error displayed in the Design tab (Figure 2-6)
Digging into the Source Code
The source code section of the ASPNET web page contains instructions written in a NET-compliant programming language such as Visual Basic NET or C# Source code tells the ASPNET engine how to generate the dynamic web page in response to a client's request Source code is inserted into the ASPNET web page using the Source tab
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You'll learn how to write source code in the remaining chapters; for now, however, it is important that you take a closer look at what source code is and how the ASPNET engine calls it
Object-Oriented Programming: A Class Act
Source code is written using object-oriented programming Object-oriented programming is a style of programming that resembles the way we naturally look at things We see the world as objects such as a computer keyboard We don't see the world as a group of parts such as keys, springs, diodes, and other components of the keyboard An object is defined as having data and actions For example, a keyboard has a specific length and width These are two of many data that defines the keyboard Also, a key on the keyboard can be pressed and released These are two actions that also define the keyboard In object-oriented programming, a class defines an object Data that is associated with the object is called a property, and actions are called methods It is important to keep in mind that a class is a definition and not a real object Some developers who are new to object-oriented programming find this a difficult concept to grasp Think of a class as a stencil of the letter W The stencil isn't the letter W Instead it defines what the letter W looks like A real W is created when you place the stencil on a piece of paper and trace the stencil The real W is seen once you remove the stencil from the paper You can use the stencil over and over again to create many copies of the letter K and all those copies are identical because they come from the same definition In object-oriented programming, copies of a class are called instances, or simply objects Each instance is identical to other instances of the same class That is, each instance has properties and methods that are defined in the class For example, when we create an instance of the keyboard, the instance will have a width and length and keys that can be pressed and released Visual Basic NET (and C#) use the NET Framework library of classes that you'll be using to build the source code for your ASPNET web page Classes will have properties whose values you can modify and other properties that cannot be modified For example, you can't change the width and length of a keyboard, but you might be able to select the color of the keyboard A class has built-in methods and methods that you write For example, pressing and releasing a key on the keyboard are built-in methods of a keyboard Picking up and moving the keyboard is a method that you define (ie, you can use one hand or two)
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