:) You need to find all the serializable types within an assembly. Solution Instead of testing the implemented interfaces and attributes on every type, you can query the Type.IsSerialized property to determine whether it is marked as serializable, as the following method does: public static Type[] GetSerializableTypes(Assembly asm) { List<Type> serializableTypes = new List<Type>(); // Look at all types in the assembly. foreach(Type type in asm.GetTypes()) { if (type.IsSerializable) { // Add the name of the serializable type. serializableTypes.Add(type); } } return (serializableTypes.ToArray()); } The GetSerializableTypes method accepts an Assembly through its asm parameter. This assembly is searched for any serializable types, and their full names (including namespaces) are returned in a Type[]. In order to use this method to display the serializable types in an assembly, run the following code: public static void FindSerializable() { Assembly asm = Assembly.GetExecutingAssembly(); Type[] serializable = GetSerializableTypes(asm); // Write out the serializable types in the assembly. if(serializable.Length > 0) { Console.WriteLine("{0} has serializable types:",asm.Location); foreach (Type t in serializable) { Console.WriteLine("\t{0}", t.FullName); } } }