Need Help with array

[jmcilhinney]

You're going about this all wrong. You should start with a Phone class:

Public Class Phone
 
    'Member declarations here.
 
End Class

You should then define a class that represents a collection of Phone objects:

Public Class PhoneCollection
    Inherits System.Collections.ObjectModel.Collection(Of Phone)
End Sub

The PhoneCollection inherits everything it needs from the Collection class, like Add and Remove methods and an Item property. You would then declare a property in your Exchange class of that type:

Public Class Exchange
 
    Private _phones As New PhoneCollection
 
    Public ReadOnly Property Phones() As PhoneCollection
        Get
            Return Me._phones
        End Get
    End Property
 
    'Other declarations here.
 
End Class

You would then add a new Phone to an Exchnage like this:

Dim myPhone As New Phone
 
myExchange.Phones.Add(myPhone)

The PhoneCollection already has a IndexOf method too, so your method with the silly name is not required.

You could then add a method to your PhoneCollection named FindByNumber that would find a Phone object given a phone number. Etc., etc.