public byte[] ToByteArray<T>(T obj)
{
    if(obj == null)
        return null;
    BinaryFormatter bf = new BinaryFormatter();
    using(MemoryStream ms = new MemoryStream())
    {
        bf.Serialize(ms, obj);
        return ms.ToArray();
    }
}

public T FromByteArray<T>(byte[] data)
{
    if(data == null)
         return default(T);
    BinaryFormatter bf = new BinaryFormatter();
    using(MemoryStream ms = new MemoryStream(data))
    {
        object obj = bf.Deserialize(ms);
        return (T)obj;
    }
}