How do you do a deep copy of an object in .NET (C# specifically)?

This question already has an answer here:

I've seen a few different approaches to this, but I use a generic utility method as such:

public static T DeepClone<T>(T obj)
{
 using (var ms = new MemoryStream())
 {
   var formatter = new BinaryFormatter();
   formatter.Serialize(ms, obj);
   ms.Position = 0;

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

Notes:

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

I wrote a deep object copy extension method, based on recursive "MemberwiseClone" . It is fast ( three times faster than BinaryFormatter), and it works with any object. You don't need a default constructor or serializable attributes.

Building on Kilhoffer's solution...

With C# 3.0 you can create an extension method as follows:

public static class ExtensionMethods
{
    // Deep clone
    public static T DeepClone<T>(this T a)
    {
        using (MemoryStream stream = new MemoryStream())
        {
            BinaryFormatter formatter = new BinaryFormatter();
            formatter.Serialize(stream, a);
            stream.Position = 0;
            return (T) formatter.Deserialize(stream);
        }
    }
}

which extends any class that's been marked as [Serializable] with a DeepClone method

MyClass copy = obj.DeepClone();

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