Visual Basic .NET - Examples

Examples

The following is a very simple VB.NET program, a version of the classic "Hello world" example created as a console application:

Module Module1 Sub Main Console.WriteLine("Hello, world!") End Sub End Module

The effect is to write the text Hello, world! to the command line. Each line serves a specific purpose, as follows:

Module Module1

This is a module definition, a division of code similar to a class, although modules can contain classes. Modules serve as containers of code that can be referenced from other parts of a program.
It is common practice for a module and the code file, which contains it, to have the same name; however, this is not required, as a single code file may contain more than one module and/or class definition.

Sub Main

This is the entry point where the program begins execution. Sub is an abbreviation of "subroutine."

Console.WriteLine("Hello, world!")

This line performs the actual task of writing the output. Console is a system object, representing a command-line interface and granting programmatic access to the operating system's standard streams. The program calls the Console method WriteLine, which causes the string passed to it to be displayed on the console. Another common method is using MsgBox (a Message Box).

This piece of code is a solution to Floyd's Triangle:

Imports System.Console Module Program Sub Main Dim rows As Integer ' Input validation. Do Until Integer.TryParse(ReadLine("Enter a value for how many rows to be displayed: "), rows) AndAlso rows >= 1 WriteLine("Allowed range is 1 and {0}", Integer.MaxValue) Loop ' Output of Floyd's Triangle Dim current = 1 For row = 1 To rows For column = 1 To row Write("{0,-2} ", current) current += 1 Next WriteLine Next End Sub '''

''' Shadows Console.ReadLine with a version which takes a prompt string. '''

Function ReadLine(Optional prompt As String = Nothing) As String If prompt IsNot Nothing Then Write(prompt) End If Return Console.ReadLine End Function End Module