public byte[] SerializeToBlob()
{
    using (var buffer = new MemoryStream())
    {
        var formatter = new BinaryFormatter();
        formatter.Serialize(buffer, this);
        buffer.Position = 0;
        return buffer.ToArray();
    }
}

public static ActionData DeserializeFromBlob(byte[] state)
{
    using (var buffer = new MemoryStream(state))
    {
        var formatter = new BinaryFormatter();
        var result = formatter.Deserialize(buffer);
        return (ActionData) result;
    }
}

byte[] actionDataBlob = ad.SerializeToBlob();
var ad1 = ActionData.DeserializeFromBlob(actionDataBlob);

filteredTasks = (List<App.Task.Entity.GetAllTasksResult>)Session["myTaskList"];