How to make a deep copy in c# with binary formatter

DeepClone.cs

using System.IO;
using System.Runtime.Serialization.Formatters.Binary;

static public class DeepCloning
{
    static public T DeepClone<T>(this T source)
    {
        var formatter = new BinaryFormatter();

        using var stream = new MemoryStream();

        formatter.Serialize(stream, source);
        stream.Position = 0;

        return (T)formatter.Deserialize(stream);
    }
}