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what is Statement in vb.net? explain with example.

statement is a complete instruction in Visual Basic programs. It may contain keywords, operators, variables, literal values, constants and expressions.

Statements could be categorized as:

  • Declaration statements – these are the statements where you name a variable, constant, or procedure, and can also specify a data type.
  • Executable statements – these are the statements, which initiate actions. These statements can call a method or function, loop or branch through blocks of code or assign values or expression to a variable or constant. In the last case, it is called an Assignment statement.

Declaration Statements

The declaration statements are used to name and define procedures, variables, properties, arrays, and constants. When you declare a programming element, you can also define its data type, access level, and scope.

The programming elements you may declare include variables, constants, enumerations, classes, structures, modules, interfaces, procedures, procedure parameters, function returns, external procedure references, operators, properties, events, and delegates.

Following are the declaration statements in VB.Net:

S.N Statements and Description Example
1 Dim Statement
Declares and allocates storage space for one or more variables.
Dim number As Integer
Dim quantity As Integer = 100
Dim message As String = "Hello!"
2 Const Statement
Declares and defines one or more constants.
Const maximum As Long = 1000
Const naturalLogBase As Object 
= CDec(2.7182818284)
3 Enum Statement
Declares an enumeration and defines the values of its members.
Enum CoffeeMugSize
    Jumbo
    ExtraLarge
    Large
    Medium
    Small
End Enum
4 Class Statement
Declares the name of a class and introduces the definition of the variables, properties, events, and procedures that the class comprises.
Class Box
Public length As Double
Public breadth As Double   
Public height As Double
End Class
5 Structure Statement
Declares the name of a structure and introduces the definition of the variables, properties, events, and procedures that the structure comprises.
Structure Box
Public length As Double           
Public breadth As Double   
Public height As Double
End Structure
6 Module Statement
Declares the name of a module and introduces the definition of the variables, properties, events, and procedures that the module comprises.
Public Module myModule
Sub Main()
Dim user As String = 
InputBox("What is your name?") 
MsgBox("User name is" & user)
End Sub 
End Module
7 Interface Statement 
Declares the name of an interface and introduces the definitions of the members that the interface comprises.
Public Interface MyInterface
    Sub doSomething()
End Interface
8 Function Statement
Declares the name, parameters, and code that define a Function procedure.
Function myFunction
(ByVal n As Integer) As Double 
    Return 5.87 * n
End Function
9 Sub Statement
Declares the name, parameters, and code that define a Sub procedure.
Sub mySub(ByVal s As String)
    Return
End Sub
10 Declare Statement
Declares a reference to a procedure implemented in an external file.
Declare Function getUserName
Lib "advapi32.dll" 
Alias "GetUserNameA" 
(
  ByVal lpBuffer As String, 
  ByRef nSize As Integer) As Integer
11 Operator Statement
Declares the operator symbol, operands, and code that define an operator procedure on a class or structure.
Public Shared Operator +
(ByVal x As obj, ByVal y As obj) As obj
        Dim r As New obj
' implemention code for r = x + y
        Return r
    End Operator
12 Property Statement
Declares the name of a property, and the property procedures used to store and retrieve the value of the property.
ReadOnly Property quote() As String 
    Get 
        Return quoteString
    End Get 
End Property
13 Event Statement
Declares a user-defined event.
Public Event Finished()
14 Delegate Statement
Used to declare a delegate.
Delegate Function MathOperator( 
    ByVal x As Double, 
    ByVal y As Double 
) As Double

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