Serializeable attribute and class heirarchy

[Dan Holmes]

UndefinedDeviceException gets serialized (throw by a remoted object and
ToString()) and is displayed by the UI. The id variable is blank as
indicated by the results of ToString(). I am missing something
rudimentary; I know it.

[Serializable]
public class UndefinedDeviceException : IAFException
{
private const string message = "This Device is not defined";
public UndefinedDeviceException(Identity id) : base(id, message) { }
public UndefinedDeviceException(SerializationInfo info,
StreamingContext context) : base (info, context) { }
}

<System.Serializable>Public Class IAFException
Inherits Exception
Protected id As String
Sub New(ByVal id As Identity, ByVal message As String)
Me.New(message)
Me.id = id.ToString()
End Sub
Sub New(ByVal message As String)
MyBase.New(message)
End Sub
Sub New(ByVal info As SerializationInfo, ByVal context As
StreamingContext)
MyBase.New(info, context)
End Sub
Public ReadOnly Property Identity(ByVal id As String)
Get
Return id
End Get
End Property
Public Overrides Function ToString() As String
Return MyBase.ToString() & System.Environment.NewLine & id
End Function
End Class