Use Modules and Class method in the VB.Net

First , we must know Modules and Class in the VB.Net.
Modules:
Modules are VB counterparts to C# static classes.
you don't want to allow inheritance and instantiation, you use a Module.
Class:
A class is a collection of objects of similar type. Once a class is defined, any number of objects can be created which belong to that class.
 Methods
A Method is a procedure built into the class. They are a series of statements that are executed when called.
Sub Procedures
Sub procedures are methods which do not return a value. Each time when the Sub procedure is called the statements within it are executed until the matching End Sub is encountered.
Function is a method which returns a value. Functions are used to evaluate data, make calculations or to transform data. Declaring a Function is similar to declaring a Sub procedure. Functions are declared with the Function keyword.
Example call Module function  and Class methods
Here , i give a program for get splitting a string using function in VB.net
In vb.Net Function will return a value.

Module Module1
    Function splittingvalue(ByVal strigs As String, ByVal sr As Char) As String()
        Dim st As String() = strigs.Split(New Char() {sr})
        Return st
    End Function

Public Class Class1

    Public Shared Sub displaymessage()
        MessageBox.Show("Good Luck")
    End Sub

End Class

How to call Functions and Methods in the Application?

  Class1.displaymessage() // Method...
  Dim result As String() = Module1.splittingvalue("Lakshmi", "k") // Function
  Dim conResult = result(0) + result(1)
  MessageBox.Show(Convert.ToString(conResult))