Visual Basic Language Keywords

MSDN Library
Development Tools and Languages
Visual Studio 2008
Visual Studio
Visual Basic
Reference (Visual Basic)
Visual Basic Reference

Typographic and Code Conventions

Visual Basic Run-Time Library Members
Keywords and Members by Task
Visual Basic Attributes
Constants and Enumerations (Visual Basic)
Data Type Summary (Visual Basic)
Directives (Visual Basic)
Functions (Visual Basic)
Keywords (Visual Basic)
Modules (Visual Basic)
Objects (Visual Basic)
Operators (Visual Basic)
Properties (Visual Basic)
Queries (Visual Basic)
Statements (Visual Basic)
Recommended XML Tags for Documentation Comments (Visual Basic)
XML Axis Properties
XML Literals
Error Messages (Visual Basic)

Visual Basic Language Keywords
This page is specific to:.NET Framework Version:1.1 2.0 3.03.5

Visual Basic Language Reference

Visual Basic Language Keywords

The following tables list all the Visual Basic language keywords.

Reserved Keywords

The following keywords are reserved, which means you cannot use them as names for your programming elements such as variables or procedures. You can bypass this restriction by enclosing the name in brackets ([ ]). For more information, see "Escaped Names" in Declared Element Names.

Note:
Using escaped names is not recommended, because it can make your code hard to read, and can lead to subtle errors that can be difficult to find.

AddHandler	AddressOf	Alias	And
AndAlso	As	Boolean	ByRef
Byte	ByVal	Call	Case
Catch	CBool	CByte	CChar
CDate	CDec	CDbl	Char
CInt	Class	CLng	CObj
Const	Continue	CSByte	CShort
CSng	CStr	CType	CUInt
CULng	CUShort	Date	Decimal
Declare	Default	Delegate	Dim
DirectCast	Do	Double	Each
Else	ElseIf	End	EndIf
Enum	Erase	Error	Event
Exit	False	Finally	For
Friend	Function	Get	GetType
GetXMLNamespace	Global	GoSub	GoTo
Handles	If	If()	Implements
Imports (.NET Namespace and Type)	Imports (XML Namespace)	In	Inherits
Integer	Interface	Is	IsNot
Let	Lib	Like	Long
Loop	Me	Mod	Module
MustInherit	MustOverride	MyBase	MyClass
Namespace	Narrowing	New	Next
Not	Nothing	NotInheritable	NotOverridable
Object	Of	On	Operator
Option	Optional	Or	OrElse
Overloads	Overridable	Overrides	ParamArray
Partial	Private	Property	Protected
Public	RaiseEvent	ReadOnly	ReDim
REM	RemoveHandler	Resume	Return
SByte	Select	Set	Shadows
Shared	Short	Single	Static
Step	Stop	String	Structure
Sub	SyncLock	Then	Throw
To	True	Try	TryCast
TypeOf	Variant	Wend	UInteger
ULong	UShort	Using	When
While	Widening	With	WithEvents
WriteOnly	Xor	#Const	#Else
#ElseIf	#End	#If	=
&	&=	*	*=
/	/=	\	\=
^	^=	+	+=
-	-=	>> Operator (Visual Basic)	>>= Operator (Visual Basic)
<<	<<=

Note:
EndIf, GoSub, Variant, and Wend are retained as reserved keywords, although they are no longer used in Visual Basic. The meaning of the Let keyword has changed. Let is now used in LINQ queries. For more information, see Let Clause (Visual Basic).

Unreserved Keywords

The following keywords are not reserved, which means you can use them as names for your programming elements. However, doing this is not recommended, because it can make your code hard to read and can lead to subtle errors that can be difficult to find.

Aggregate	Ansi	Assembly	Auto
Binary	Compare	Custom	Distinct
Equals	Explicit	From	Group By
Group Join	Into	IsFalse	IsTrue
Join	Key (Visual Basic)	Mid	Off
Order By	Preserve	Skip	Skip While
Strict	Take	Take While	Text
Unicode	Until	Where	#ExternalSource
#Region

Reference

Visual Basic Run-Time Library Members

Keywords and Members by Task

Keywords Compared in Different Languages

Community Content

code for stream writer and reader

Added by:studennt

Dim szname As String
Try
Using sw As IO.StreamWriter = New IO.StreamWriter("\\mydocuments\names.txt")
For n As Integer = 0 To Lstbox.Items.Count - 1
szname = Lstbox.Items(n).ToString
sw.Write(szname)
sw.WriteLine()
Next
sw.Close()
End Using
Catch ex As Exception
End Try

stream reader

Dim srname As String
Try
Using sr As IO.StreamReader = New IO.StreamReader("\\mydocuments")
Do While Not sr.EndOfStream
srname = sr.ReadLine
Lstbox.Items.Add(srname)
Loop
sr.Close()
End Using
Catch ex As Exception
End Try

Private Sub Lstbox_DoubleClick(ByVal sender As Object, ByVal e As System.EventArgs) Handles Lstbox.DoubleClick
Dim n As Integer
Name = Lstbox.SelectedIndex
If n >= 0 Then
MessageBox.Show(Lstbox.Items(n).ToString)
End If

message box

Dim LeftPos As Integer
'student id
If (IsNumeric(TxtstudentID.Text)) Then
If (Val(TxtstudentID.Text) >= 0 And Val(TxtstudentID.Text) <= 9999999) Then
LeftPos = Val(TxtstudentID.Text)
Else
MessageBox.Show("Invalid number")
End If