In the old .NET Framework days, you could use the BinaryFormatter class to serialize and deserialize objects. This can be convenient for cloning or storing some session states. As the BinaryFormatter has some serious security concerns, the .NET team marked it as obsolete (as error) in .NET 7 and onwards.

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The article discusses the replacement for BinaryFormatter in .NET 8 and explores alternative serialization methods such as System.Text.Json, Newtonsoft.Json, and MessagePack. It also includes performance benchmarks comparing these methods.

A replacement for BinaryFormatter in .NET 8