Public Class DepositForm
  Inherits TransactionForm

  Public Sub New()
    MyBase.New()

    'This call is required by the Windows Form Designer.
    InitializeComponent()

    'Add any initialization after the InitializeComponent() call
  End Sub

  Protected Overrides Sub SaveData(ByRef BinSerialize As BinaryFormatter, _
                                   ByRef TranFile As Stream)
    BinSerialize.Serialize(TranFile, DepositToField.ToString())
  End Sub

   ...

End Class

Public Class WithdrawForm
  Inherits TransactionForm

  Public Sub New()
    MyBase.New()

    'This call is required by the Windows Form Designer.
    InitializeComponent()

    'Add any initialization after the InitializeComponent() call
  End Sub

  Protected Overrides Sub SaveData(ByRef BinSerialize As BinaryFormatter, _
                                   ByRef TranFile As Stream)
    BinSerialize.Serialize(TranFile, PayToField.ToString())
  End Sub

   ...

End Class