public class ObjectGenerator
{
    public T GenerateObject<T>()
    {
        return (T)FormatterServices.GetUninitializedObject(typeof(T));
    }

    public T ActivateObject<T>()
    {
        return (T)Activator.CreateInstance<T>();
    }
}

ObjectGenerator og = new ObjectGenerator();

Stopwatch sw = new Stopwatch();
Console.Write("Generate Object [Formatter]: ");

sw.Start();

for (int i = 0; i < 10000; i++)
{
    TestClass tc = og.GenerateObject<TestClass>();
}

sw.Stop();

Console.WriteLine(sw.ElapsedMilliseconds);

sw.Reset();

Console.Write("Generate Object [Activator]: ");

sw.Start();

for (int i = 0; i < 10000; i++)
{
    TestClass tc = og.ActivateObject<TestClass>();
}

sw.Stop();

Console.WriteLine(sw.ElapsedMilliseconds);

Console.ReadKey();

Generate Object [Formatter]: 3
Generate Object [Activator]: 21

public class TestClass
{
    private TestClass() { }

    public string GetMessage()
    {
        return "This is a message";
    }
}

Für dieses Objekt wurde kein parameterloser Konstruktor definiert.

public class Binder : SerializationBinder
{
    public override Type 
        BindToType(string assemblyName, string typeName)
    {
        Type type = null;
        string shortAssem = assemblyName.Split(',')[0];
        Assembly[] assemblies = 
            AppDomain.CurrentDomain.GetAssemblies();

        foreach (Assembly assem in assemblies)
        {
            if (shortAssem == assem.FullName.Split(',')[0])
            {
                type = assem.GetType(typeName);
                break;
            }

        }
        return type;

    }

}