Example of Singleton Design pattern

The main key feature of singleton pattern is that only one single instance will created of the given object.

EXAMPLE

Public Class SingletonCode

'shared members

Private Shared _instance As New SingletonCode

Public Shared Function Instance() As SingletonCode

Return _instance

End Function

'instance members

Private Sub New()

'public instantiation disallowed

End Sub

'other instance members

'...

End Class