Problem with deserialization of C# object. Where is the mistake?

Question

C++ / C#

The object is serialized in one program, then the file is transferred to another program and it desserializes it, here is the error text:

Answer 1

2 possible solutions: serialize in xml or make sure that the class that is serialized would be in a separate library.

Answer 2

Serialization and deserialization must be in the same assembly. Otherwise, it cannot recognize types. Therefore, serialization / deserialization methods are taken out in one project / dll. Or serialize to xml, then the methods can be spread across different assemblies.