This document provides an introduction and overview of VB.NET (Visual Basic .NET). It discusses what VB.NET is, its features, why it is used as a professional language, advantages and disadvantages. It also describes the structure of a VB.NET program, including namespaces, classes, modules, procedures, variables, and the main procedure. It explains the compilation and execution process of a VB.NET program in Visual Studio. An example VB.NET "Hello World" program is provided to demonstrate the core components.
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2. 2
Content
What is VB.NET?
Features of VB.NET
VB.NET as a Professional Language
Advantages of VB.NET
Disadvantages of .NET
VB.NET Program Structure
Compilation and Execution of VB.NET Program
Example
3. 3
What Is .NET?
The VB.NET stands for Visual Basic. Network Enabled Technologies.
It is a simple, high-level, object-oriented programming language developed by
Microsoft in 2002.
It is a successor of Visual Basic 6.0, that is implemented on the Microsoft .NET
framework.
Furthermore, it supports the OOPs concept, such as abstraction, encapsulation,
inheritance, and polymorphism. Therefore, everything in the VB.NET language is an
object, including all primitive data types (Integer, String, char, long, short, Boolean,
etc.), user-defined data types, events, and all objects that inherit from its base class.
It is not a case sensitive language, whereas, C++, Java, and C# are case sensitive
language.
Applications built using the VB.NET language are very reliable and scalable, relying
on the .NET Framework to access all libraries that help to execute a VB.NET
program.
Applications or programs of VB.NET are not only running on the window operating
system but can also run on Linux or Mac OS.
4. 4
Features of VB.NET:-
It is an object-oriented programming language that follows various oops concepts such as
abstraction, encapsulation, inheritance, and many more. It means that everything in VB.NET
programming will be treated as an object.
This language is used to design user interfaces for window, mobile, and web-based applications.
It supports a rapid application development tool kit. In which a developer does not need to write
all the codes as it can get various code automatically from its libraries. For example, when we
create a form in Visual basic.net, it automatically calls events of various form in that class.
It supports Boolean condition for decision making in programming.
It also supports the multithreading concept, in which you can do multiple tasks at the same time.
It provides simple events management in .NET application.
A Window Form enables us to inherit all existing functionality of form that can be used to create a
new form. So, in this way, it reduced the code complexity.
It uses an external object as a reference that can be used in a VB.NET application.
Automatic initialized a garbage collection.
It follows a structured and extensible programming language for error detection and recovery.
Conditional compilation and easy to use generic classes.
5. 5
Why VB.NET as a Professional Language?
The following reasons make VB.Net a widely used professional language −
Modern, general purpose.
Object oriented.
Component oriented.
Easy to learn.
Structured language.
It produces efficient programs
It can be compiled on a variety of computer platforms.
Part of .Net Framework.
6. 6
Advantages of VB.NET
The VB.NET executes a program in such a way that runs under CLR (Common Language
Runtime), creating a robust, stable, and secure application.
It is a pure object-oriented programming language based on objects and classes. However,
these features are not available in the previous version of Visual Basic 6. That's why Microsoft
launched VB.NET language.
Using the Visual Studio IDE, you can develop a small program that works faster, with a large
desktop and web application.
The .NET Framework is a software framework that has a large collection of libraries, which
helps in developing more robust applications.
It uses drop and drag elements to create web forms in .NET applications.
However, a Visual Basic .NET allows to connect one application to another application that
created in the same language to run on the .NET framework.
A VB.NET can automatically structure the code.
The Visual Basic .NET language is also used to transfer data between different layers of the .NET
architecture such that data is passed as simple text strings.
It uses a new concept of error handling in the Visual Basic .NET Framework. The new structure
is the try, catch, and finally method used to handle exceptions as a unit. In addition, it allows
appropriate action to be taken at the place where it encountered an error. In this way, it
discourages the use of the ON ERROR GOTO statement in .NET programming.
7. 7
Disdvantages of VB.NET
The VB.NET programming language is unable to handle pointers directly. Because in this
language, it requires a lot of programming, and it is not easy to manage every address by a
pointer. Furthermore, additional coding takes extra CPU cycles, that increases the processing
time. It shows the slowness of the VB.NET application.
The VB.NET programming is easy to learn, that increases a large competition between the
programmers to apply the same employment or project in VB.NET. Thus, it reduces a secure job
in the programming field as a VB.NET developer.
It uses an Intermediate Language (IL) compilation that can be easily decompiled (reverse
engineered), but there is nothing that can prevent an application from disintegrating.
Just-In-Time (JIT) compiler: It is the process through which a computer can interpret IL
(intermediate language) compilation and is also required to run your application. It means that the
target computer needs a JIT compiler to interpret a source program in IL, and this interpretation
requires an additional CPU cycle that degrades the performance of an application.
It contains a large collection of libraries for the JIT compiler that helps to interpret an application.
These large libraries hold a vast space in our system that takes more computing time.
8. 8
VB.NET Program Structure
A VB.Net program basically consists of the following parts −
Namespace declaration
A class or module
One or more procedures
Variables
The Main procedure
Statements & Expressions
Comments
9. 9
VB.NET Program Structure
The first line of the program Imports System is used to include
the System namespace in the program.
The next line has a Module declaration, the module Module1.
VB.Net is completely object oriented, so every program must
contain a module of a class that contains the data and
procedures that your program uses.
Classes or Modules generally would contain more than one
procedure. Procedures contain the executable code, or in other
words, they define the behavior of the class.
The next line( 'This program) will be ignored by the compiler and
it has been put to add additional comments in the program.
The next line defines the Main procedure, which is the entry point
for all VB.Net programs. The Main procedure states what the
module or class will do when executed.
The Main procedure specifies its behavior with the statement
Console.WriteLine("Hello World") WriteLine is a method of
the Console class defined in the System namespace. This
statement causes the message "Hello, World!" to be displayed on
the screen.
The last line Console.ReadKey() is for the VS.NET Users. This
will prevent the screen from running and closing quickly when the
program is launched from Visual Studio .NET.
Imports System
Module Module1
'This program will display Hello World
Sub Main()
Console.WriteLine("Hello World")
Console.ReadKey()
End Sub
End Module
Note: A procedure could be any of the following −
Function
Sub
Operator
Get
Set
AddHandler
RemoveHandler
RaiseEvent
10. 10
Compilation and Execution VB.NET Program
In Visual Studio.Net IDE following steps are
used
1. Start Visual Studio.
2. On the menu bar, choose File → New →
Project.
3. Choose Visual Basic from templates
4. Choose Console Application.
5. Specify a name and location for your
project using the Browse button, and then
choose the OK button.
6. The new project appears in Solution
Explorer.
7. Write code in the Code Editor.
8. Click the Run button or the F5 key to run
the project. A Command Prompt window
appears that contains the line Hello World.
In Visual Studio IDE following steps are used
1. Open a text editor and add the above
mentioned code.
2. Save the file as helloworld.vb
3. Open the command prompt tool and go to
the directory where you saved the file.
4. Type vbc helloworld.vb and press enter to
compile your code.
5. If there are no errors in your code the
command prompt will take you to the next
line and would
generate helloworld.exe executable file.
6. Next, type helloworld to execute your
program.
7. You will be able to see "Hello World"
printed on the screen.
11. 11
VB.NET Program Example
Imports System
Module Module1
'This program will display Hello World
Sub Main()
Console.WriteLine("Hello World")
Console.ReadKey()
End Sub
End Module