VB.NET Statements

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In VB.NET, a statement is a complete instruction. It can contain keywords, operators, variables, constants, and expressions. The statements can be categorized into the following categories.

Declaration Statements

You use declaration statements 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.

Declaration statements include the following.

Statement Description
Dim Declares and allocates storage space for one or more variables.
Const Declares and defines one or more constants.
Enum Declares an enumeration and defines the values of its members.
Class Declares the name of a class and introduces the definition of the variables, properties, events, and procedures that the class comprises.
Structure Declares the name of a structure and introduces the definition of the variables, properties, events, and procedures that the structure comprises.
Module Declares the name of a module and introduces the definition of the variables, properties, events, and procedures that the module comprises.
Interface Declares the name of an interface and introduces the definitions of the members that the interface comprises.
Function Declares the name, parameters, and code that defines a Function procedure.
Declare Declares a reference to a procedure implemented in an external file.
Operator Declares the operator symbol, operands, and code that define an operator procedure on a class or structure.
Event Declares a user-defined event.
Delegate Used to declare a delegate. A delegate is a reference type that refers to a Shared method of a type or an instance method of an object.

The following example contains three declarations.

Sub Example1()
    Const maxAge As Integer = 60
    Dim height As Double = 6.5
End Sub
  • The first declaration is the Sub statement, it declares a procedure named which is Public.
  • The second declaration is the Const statement, which declares the constant maxAge, specifying the Integer data type and a value of 60.
  • The third declaration is the Dim statement, which declares the variable height.

Executable Statements

An executable statement performs an action. It can call a procedure, branch to another place in the code, loop through several statements, or evaluate an expression. An assignment statement is a special case of an executable statement.

The following example uses an If...Then...Else control structure to run different blocks of code based on the value of a variable.

Sub ExecutableStatement()
    Dim a As Integer = 13

    If (a < 20) Then
        Console.WriteLine("a is less than 20")
        Console.WriteLine("a is greater than 20")
    End If

    Console.WriteLine("value of a is : {0}", a)
End Sub

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