public static bool operator == (Person person1, Person person2)
   {
      if (((object)person1) == null || ((object)person2) == null)
         return Object.Equals(person1, person2);

      return person1.Equals(person2);
   }

interface IMyInterface{};
//
class A{}
//
class B : A, IMyInterface{};
//
class C : A, IMyInterface{};

B myClassB = new B;
IMyInterface inter = myClassB;

A car = new A();
A truck = new B();

Private Function Foo() As String
    Static FSO As Scripting.Dictionary
    Set FSO = New Scripting.Dictionary

End Function

Public Function Foo() As String
  Static FSO As Scripting.FileSystemObject
  If FSO Is Nothing Then
    Set FSO = New Scripting.FileSystemObject
  End If
End Function

#If LateBind Then
Public Function FSO() As Object
  Static f As Object
#Else
Public Function FSO() As Scripting.FileSystemObject
  Static f As Scripting.FileSystemObject
#End If

  If f Is Nothing Then
    Set f = CreateObject("Scripting.FileSystemObject")
  End If
  Set FSO = f
End Function

Public Function TakeANumber() As Long
  Static Number As Long

  Number = Number + 1
  TakeANumber = Number
End Function