VB.NET Keywords

A keyword is a reserved word with special meanings in the compiler, whose meaning cannot be changed. Therefore, these keywords cannot be used as an identifier in VB.NET programming such as class name, variable, function, module, etc.

In this section, we will understand about the VB.NET identifier, VB.NET comment, and how we can use it in VB.NET.

There are following reserved keyword available in the VB.NET language.

AddHandler	AddressOf	Alias	And	AndAlso	As
Boolean	ByRef	Byte	ByVal	Call	Case
Catch	CBool	CByte	CChar	CDate	CDbl
CDec	Char	Cint	Class	CLng	CObj
Const	Continue	CSByte	CShort	CSng	CStr
CType	CUnit	CULng	CUShort	Date	Decimal
Declare	Default	Delegate	Dim	DirectCast	Do
Double	Each	Else	Elseif	End	End if
Enum	Erase	Error	Event	Exit	False
Finally	For	Friend	Function	Get	GetType
GetXML Namespace	Global	GoTO	Handles	If	Implements
Imports	In	Inherits	Integer	Interface	Is
isNot	Let	Lib	Like	Long	Loop
Me	Mod	Module	MustInherit	MustOverride	MyBase
MyClass	Namespace	Narrowing	New	Next	Not
Nothing	Not Inheritable	Not Overridable	Object	Of	On
Operator	Option	Optional	Or	OrElse	Overloads
Overridable	Overrides	ParamArray	Partial	Private	Property
Protected	Public	RaiseEvent	ReadOnly	ReDim	REM
Remove Handler	Resume	Return	SByte	Select	Set
Shadows	Shared	Short	Single	Static	Step
Stop	String	Structure	Sub	SyncLock	Then
Throw	To	True	Try	TryCast	TypeOf
UInteger	While	Widening	With	WithEvents	WhiteOnly
Xor	#Else	IsReference	TimeOfDay	Append	Auto

Let's create a program to find the area and perimeter of a rectangle in VB.NET.

Rectangle.vb

Module Rectangle
    Public Length As Integer

    Public Breadth As Integer
    Public Sub Dimension()
        Length = 5
        Breadth = 6
    End Sub
    Public Function Area() As Integer
        Area = Length * Breadth
    End Function
    Public Function Pera() As Integer
        Pera = 2 * (Length + Breadth)
    End Function
    Public Sub Display()
        Console.WriteLine(" Length is: {0}", Length)
        Console.WriteLine("Breadth is: {0}", Breadth)
        Console.WriteLine(" Area of Rectangle is: {0}", Area())
        Console.WriteLine(" Perimeter of Rectangle is: {0}", Pera())
    End Sub
    Sub Main()
        Dimension() ' directly call the function in main method
        Area()
        Pera()  ' directly call the function in main method
        Display()
        Console.WriteLine("Press any key to exit...")
        Console.ReadKey()
    End Sub
End Module

Output:

Length is: 5
Breadth is: 6
Area of Rectangle is: 30
Perimeter of Rectangle is: 22
Press any key to exit...

VB.NET Identifiers

As the name defines, an identifier is used to identify the name of variable, function, class, or any other user-defined elements in the program. An identifier should be the combination of letter, digit, and underscore. Still, the first character of the identifier or variable name should start with alphabet letter or underscore (_) of any length.

There are various rules for identifier in VB.NET, as follows:

The first character of an identifier must start with an alphabet or underscore, that could be followed by any sequence of digits (0-9), letter or underscore.
An identifier should not contain any reserved keyword.
It should not start with any digit.
It should not more than 51 characters.
An identifier can contain two underscores, but should not be consecutive.
It should not include any commas or white spaces in-between characters.

Generally, identifiers are meaningful names. Some valid identifiers are:

Value, a, rec1, my_data, Marks, num, etc.

Some invalid identifiers are:

5be : First character should be alphabets or underscore (_)

Class, Shared : Keyword are not allowed as identifier name.

A# - : Identifier does not contain any special symbol.

Avg marks : It should not contain any blank space.

Program.vb

Imports System
Module Program ' Identifier' name should be valid

    Public Sub myfunc()  ' function name 
        Console.WriteLine("Hello friends..")
    End Sub

    Sub Main()
        myfunc()
        Console.WriteLine("Nice to meet you...")
        Console.WriteLine("press any key to exit...")
        Console.ReadKey()
    End Sub
End Module

Let's compile and execute the above program.

Output:

Hello friends...
Nice to meet you...
press any key to exit...

VB.NET Comments

A comment is used to explain the various steps that we have taken in our programming. The compiler ignores these comment statements because the compiler is not executed or processed in VB.NET. Therefore, it does not take any place in your compilation code.

In VB.NET, we use ( ' ) symbol to comment a statement.

Sub main()
'Here Console.WriteLine() is used to print a statement.
Console.WriteLine(" Welcome to JavaTpoint")
'Above statement displays Welcome to JavaTpoint
End Sub

Circle.vb

Imports System 
Public Class Circle 
  'define the variable
    Dim radius As Integer = 10 
    Public Function SetCircle() As Double  
            SetCircle = 2 * 3.14 * radius  ' Function is used to return some value
        End Function
        Public Sub display()         ' create display() sub function to print the message 
            Console.Write(" Radius is: {0}", radius)
        Console.WriteLine(" Circumference of Circle: {0}", SetCircle())
    End Sub
    'Shared keyword can be used without creating an object
    Shared Sub Main() 
        Dim obj As New Circle()
        obj.SetCircle() 'object reference
        obj.display()
        Console.ReadKey()
    End Sub
End Class

Now compile and execute the above program.

Output:

Radius is: 10 Circumference of Circle: 62.8
 press any key to exit...

Hence, it is the best way to explain every step of VB.NET programming language.

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