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Our coverage of the new Visual Basic is not going to be like some other books that hold their topic at an arm's length and just give you dry documentation.
This book is written from the programmer's point of view, for programmers, and I'm going to try to give you as much of the good stuff as I can.
I use Visual Basic. NET a lot myself, and I know that to master this subject, nothing is better than an in-depth treatment with many examples and tips that will save you a lot of time. Visual Basic has a long and, so far, glorious history.
When it first appeared, it created a revolution in Windows programming. Visual Basic introduced unheard-of ease to Windows programmingjust build the program you want, right before your eyes, and then run it. In so doing, it changed programming from a chore to something very like fun. In time, Visual Basic has gotten more complex, as well as more powerful. Today, it's more complex than ever, and if you've used Visual Basic 6.
In this book, you'll see how to use Visual Basic in a task-oriented way, which is the best way to write about programming. Instead of superimposing some abstract structure on the material in this book, I'll organize it the way programmers want ittask by task. I'll start with an overview of Visual Basic, taking a look at topics common to the material in the rest of the book. In this chapter, we'll create the foundation we'll rely on later as we take a look at the basics of Visual Basic.
This includes learning how to create Visual Basic projects, seeing what's in such projects, seeing what's new in Visual Basic. NET, getting an overview of essential Visual Basic. NET concepts such as Windows and Web forms, controls, events, properties, methods, and so on. Note, however, that I'll assume you have at least a little experience with Visual Basic and programming in this chapter.
The IDE is what you see when you start Visual Basic, and it's where you develop your applications and debug them. Understanding the IDE and how to use itand mastering some fundamental Visual Basic conceptswill give us the foundation we need for the rest of the book.
Many Visual Basic programmers do not have formal programming training, so they have to learn a lot of this material the hard way. As programming has matured, programmers have learned more about what are called "best practices"the programming techniques that make robust, easily debugged programs.
We'll take a look at those practices in this chapter, because they are becoming more essential for programmers in commercial environments these days, especially those programmers who work in teams. And we'll look at those practices from the viewpoint of programmers who program for a living, because frequently there's a gap between the way best practices are taught by academics and how they are actually needed by programmers facing the prospect of writing a 20, line program as part of a programming team.
Before we start covering all the details in Visual Basic in depth, let's take a look at an example first. Rather than getting lost in the details, let's see Visual Basic at work immediately. Because there are so many details one has to master, it's easy to forget that Visual Basic is there to make things as easy as possible for you.
In fact, as stated earlier, programming in Visual Basic can be as close to fun as programming gets. I'm not going to go into the details here, because we'll cover them later in this chapterright now, let's just have a little fun. Figure 1. Generally speaking, there are three types of applications in Visual Basicthose based on Windows forms such applications are usually local to your machine , Web forms that come to you across the Internet , and console applications that run in a DOS window.
I'll take a look at Windows forms here first, as those will be the most familiar to Visual Basic 6. Creating a Windows Application To create an application based on Windows forms, select the New item in the File menu, then select the Project item in the submenu that appears. High-level languages sit on top of a common intermediate language, which gives them access to the. NET system services. These services include high-level services such as ASP. NET and Windows Forms as well as lower-level access to the.
NET class libraries on which everything is based. NET archeticture. NET is.
These two components, together with the box at the bottom of the figure, form part of the Common Language Runtime CLR. NET, Microsoft has taken a radical step in deciding that programming languages are no longer independent in the way that they are compiled or interpreted and build executable code. In traditional programming, each compiled language tends to produce its own unique form of intermediate binary code.
Every language has its own data types, and may be object-oriented OO or not. Functions have their own particular parameter passing mechanisms, and differ in the order in which arguments are pushed onto the stack and whose responsibility it is to remove them. There are problems associated with such middle-layer software, such as the fact that they add complexity, and that they only tend to support a subset of functionality that all languages can agree on.
All languages that execute within the. NET Framework compile down to the same thing: a variety of bytecode known as Intermediate Language or IL rather than to a language- specific intermediate object code.
A more recent example is Java, where source code is compiled into Java bytecode, which is then executed by the Java Virtual Machine. There are, however, enough similarities to bytecode for the comparison to be useful in this discussion.
IL is unusual among intermediate languages in that it has direct support for the constructs needed by OO programming languages, such as inheritance and polymorphism, along with other modern language features like exception handling.
This means that it will be easy to port OO languages to work in. NET subject to a few constraints, such as the use of single inheritance only. NET or VB. This is a very important point, and one that is discussed in more detail in Chapter 2. This makes it very easy for OO languages to work together, but it does mean that an occasional language feature in some languages may have to be modified in order to make them work with the.
NET model. NET and compile down to bytecode called managed code. The choice is made per class, and you can mix and match managed and unmanaged classes within the same application. It turns out that using an intermediate language has a lot of advantages, many of which are discussed in the rest of this chapter. One of these advantages is the fact that all compiled code ends up looking the same regardless of which source language it started out in.
This means that it is easy to mix code written in different languages because they are now compatible at the bytecode level. If languages are to be truly compatible in this way, they need to agree on a basic set of language features and data types, which all languages must support, as well as conventions for how they are used.
The CLS provides this basic functionality, and it ensures that if a language follows its recommendations, it will be able to interoperate with others that do the same.
The CLS has been made freely available to compiler developers, and many language designers and vendors have already said that they will provide support for IL in their compilers. NET family. NET code is executed.
It is built upon a single, common language—IL—into which source languages are compiled and includes mechanisms for executing the compiled code. This includes code verification and just-in-time JIT compilation, garbage collection and enforcement of security policies, and the provision of profiling and debugging services. The CLR provides a lot of added value to the programs it supports.
Because it controls how a. It provides in-depth material on the new object-oriented features of Visual Basic. Plus readers will learn the crucial Visual Bas Visual Basic. Plus readers will learn the crucial Visual Basic tool set in detail including best Visual Basic programming practices, from design tools to flowcharts.
Using the popular Black Book format, this book provides in-depth analyses of VB. NET technologies and hundreds of immediate programming solutions making it an invaluable desktop companion. Get A Copy. Published by Coriolis Group Books first published December 1st More Details Original Title.
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Sort order. Jan 30, Minhajur Rahman Khan rated it liked it. Basic Programming in Visual Basic. View 1 comment. Mar 25, Eric Lyng rated it it was amazing. After 15 years, this book is still one of my most useful VB. A very well written book for beginners also. I have trained several developers with this book.
Although it is a good read for a programmer, it is more of a reference manual to help you get through troubleshooting of a vb. Jul 18, Abhishek Vachharajani marked it as to-read. Abed rated it it was amazing Oct 18, Naura rated it it was ok Apr 23, Vamsi Rathnakar rated it it was amazing Dec 21, Syedfarooq10 rated it it was amazing Dec 18, Balasubramanian rated it it was ok Feb 03, Vrinda Modi rated it really liked it Jan 06, Afeefa T rated it it was ok Dec 03,