Public Class TransactionForm
  Inherits System.Windows.Forms.Form

  Public Sub New()
    MyBase.New()

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

  Public Overridable Function Save(ByVal FileName As String) As Boolean
    'declare a file and serialize class
    Dim TranFile As Stream
    Dim BinSerialize As BinaryFormatter

    'Set the return value to True
    Save = True

    'Use Try/Catch to handle any errors
    Try
      'Allocate and create a new file and serialize objects
      TranFile = File.Open(FileName, FileMode.Create)
      BinSerialize = New BinaryFormatter()

      'Serialize the form data
      BinSerialize.Serialize(TranFile, AmountField.ToString())
      BinSerialize.Serialize(TranFile, MemoField.ToString())
      BinSerialize.Serialize(TranFile, DateField.ToString())
    Catch
      'Indicate an error occurred
      Save = False
    End Try

    TranFile.Close()
  End Function

    ...

End Class