The Module statement declares the name of a module and introduces the definition of the variables, properties, events, and procedures that the module comprises.
Module only at the namespace level and must be declared in a source file or namespace, and it cannot be declared in a class, structure, module, interface, procedure, or block.A module is similar to a class, but there are some important differences as well.
Modules are VB.NET counterparts to C# static classes. When your class is designed solely for helper functions and extension methods, and you don't want to allow inheritance and instantiation, you use a Module.
Let's consider the following example in which we have defined a Module.
Public Module Constants
Public Sub Example1()
Const DaysInYear = 365
Const WorkDays = 250
Console.WriteLine(DaysInYear)
Console.WriteLine(WorkDays)
End Sub
Public Sub Example2()
Const MyInteger As Integer = 42
Const DaysInWeek As Short = 7
Const Sunday As String = "Sunday"
Console.WriteLine(MyInteger)
Console.WriteLine(DaysInWeek)
Console.WriteLine(Sunday)
End Sub
Public Sub Example3()
Const num1 As Integer = 4, num2 As Integer = 5, str1 As String = "Test String"
Console.WriteLine(num1)
Console.WriteLine(num2)
Console.WriteLine(str1)
End Sub
End Module
To call the procedure defined in a Module, use the module name as shown below.
Module Program
Sub Main()
Constants.Example1()
Constants.Example2()
Constants.Example3()
End Sub
End Module