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.
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
Sub statement, it declares a procedure named which is Public.Const statement, which declares the constant maxAge, specifying the Integer data type and a value of 60.Dim statement, which declares the variable height.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")
Else
Console.WriteLine("a is greater than 20")
End If
Console.WriteLine("value of a is : {0}", a)
Console.ReadLine()
End Sub