Chapter 2. Getting Started with VB.NET
You can use VB.NET to create three different types of programs:
The .NET platform is
. The VB.NET language was developed to allow .NET programmers to create very large, powerful,
web applications quickly and easily. The .NET technology for creating web applications is called ASP.NET.
generation from ASP (Active Server Pages), is
of two Microsoft development technologies: Web Forms and Web Services. While the development of fully realized web applications using these technologies is beyond the scope of this book, learning the basics of the VB.NET language will
get you started in the right direction. VB.NET is
to be one of the languages of choice for ASP.NET development.
Typically, you'll create an ASP.NET application when you want your program to be available to end users on any platform (e.g., Windows, Mac, Unix). By serving your application over the Web, end users can access your program with any browser.
When you want the richness and power of a native application running directly on the Windows platform, alternatively you might create a desktop-bound Windows application. The .NET tools for building Windows applications are called Windows Forms; a detailed analysis of this technology is also beyond the scope of this book.
However, if you don't need a Graphical
Interface (GUI) and just want to write a simple application that talks to a console window (i.e., what we used to call a DOS box), you might consider creating a console application. This book makes
use of console applications to
the basics of the VB.NET language.
Web, Windows, and console applications are described and
in the following pages.
A console application runs in a console window, as shown in Figure 2-1. A console window (or DOS box) provides simple text-based output.
Console applications are very helpful when learning a language because they strip away the distraction of the Graphical User Interface. Rather than spending your time creating complex windowing applications, you can focus on the details of the language constructs, such as how you create classes and
, how you branch based on runtime conditions, and how you loop. All these topics will be covered in detail in coming chapters.
Figure 2-1. A console application
A Windows application runs on a PC's desktop. You are already familiar with Windows applications such as Microsoft Word or Excel. Windows applications are much more complex than console applications and can take advantage of the full suite of
, controls, and other widgets you've come to expect in a modern desktop application. Figure 2-2 shows the output of a simple windows application.
Figure 2-2. A Windows application
An ASP.NET application runs on a web server and delivers its functionality through a browser, typically over the Web. ASP.NET technology facilitates developing web applications quickly and easily. Figure 2-3 shows a message from a simple ASP.NET application.
Although most commercial applications will be either Windows or ASP.NET programs, console applications have a tremendous advantage in a VB.NET primer. Windows and ASP.NET applications bring a lot more overhead; there is great complexity in managing the window and all the events associated with the window. (Events are covered in Chapter 18.) Console applications keep things simple, allowing you to focus on the features of the language.
Figure 2-3. An ASP.NET application
This book does not ever go into all the myriad details of building robust Windows and ASP.NET applications. For complete coverage of these topics,
Programming .NET Windows Applications
both by Jesse Liberty and Dan Hurwitz (O'Reilly).