Declaring and using Constants

You use the Const statement to declare a constant and set its value. By declaring a constant, you assign a meaningful name to a value. Once a constant is declared, it cannot be modified or assigned a new value.
You declare a constant within a procedure or in the declarations section of a module, class, or structure. Class or structure-level constants are Private by default, but may also be declared as Public for the appropriate level of code access.

To declare a constant

Write a declaration that includes an access specifier, the Const keyword, and an expression, as in the following examples:

Public Const DaysInYear = 365
Private Const WorkDays = 250

To declare a constant that has an explicitly stated data type

Write a declaration that includes the As keyword and an explicit data type, as in the following examples:

Public Const MyInteger As Integer = 42
Private Const DaysInWeek As Short = 7
Protected Friend Const Funday As String = "Sunday" 

To declare multiple constants on a single line

Separate the declarations with a comma and a space, as in the following example:

Public Const Four As Integer = 4, Five As Integer = 5,

                                  Six As Integer = 44