Get Enumerator from Collection for custom object : IEnumerator « Collections « VB.Net Tutorial

1. VB.Net Tutorial
2. Collections
3. IEnumerator

Imports System.Collections

public class Test
   public Shared Sub Main
        Dim employees As New Collection
        employees.Add(New Employee("A"))
        employees.Add(New Manager("B"))
        employees.Add(New Employee("C"))

        Dim emp As Employee
        Dim employee_enumerator As IEnumerator
        employee_enumerator = employees.GetEnumerator()
        Do While (employee_enumerator.MoveNext)
            emp = CType(employee_enumerator.Current, Employee)
            Console.WriteLine(emp.Name)
        Loop

   End Sub
End class

Public Class Employee
    Public Name As String

    Public Sub New(ByVal new_name As String)
        Name = new_name
    End Sub

    Public Overridable Function IsManager() As Boolean
        Return False
    End Function
End Class

Public Class Customer
    Public Name As String

    Public Sub New(ByVal new_name As String)
        Name = new_name
    End Sub
End Class

Public Class Manager
    Inherits Employee

    Public Sub New(ByVal new_name As String)
        MyBase.new(new_name)
    End Sub
    Public Overrides Function IsManager() As Boolean
        Return True
    End Function
End Class

A
B
C