I just left to do some thinking where I get my best thinking done. While washing my hands, I realized I should mention a few issues with my previous recommendation.
Adding the SerializableAttribute to a class indicates to .NET that the class may be automatically serialized via reflection. When the class is being serialized, .NET uses reflection to obtain the values of every private, protected, and public member. What this means for your exception class, is that any properties it exposes should themselves be serializable. Should .NET attempt to serialize your class, and your class contains a member that cannot be...