BinaryFormatter.Deserialize “unable to find assembly” after ILMerge

Question

I have a C# solution with a referenced dll (also C# with the same .Net version). When I build the solution and run the resulting exe, without merging the exe and the refere

Answer 1

You may have serialized that from the separate assembly and then tried to deserialize it with another assembly (or a newer version of the same assembly).

Some discussion here