Binary Serializer

Other Serialization technologies include XML and JSON Serialization.

System.Runtime.Serialization.Formatters.Binary

The stream should be wrapped in a using statement for production ready code.

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var stream = new MemoryStream();
var formatter = new BinaryFormatter();
formatter.Serialize(stream, someObject);
stream.Seek(0, SeekOrigin.Begin); // Rewind the stream with offset of 0 from the begining
stream.Close();

Caveat

The object being serialized needs to have the [Serializable] attribute / annotation.

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[Serializable]
public class Person
{
    public string FirstName;
    public Address Address;
    
    ...

References