//dictionary to byte[]
 public byte[] ObjectToByteArray<T>(this T obj)
    {
        MemoryStream m = new MemoryStream();
        if (obj != null)
        {
            BinaryFormatter b = new BinaryFormatter();
            b.Serialize(m, obj);
        }
        return m.ToArray();
    }

//byte[] to dictionary
//T == the type (object) to return
public T ByteArrayToObject<T>(this byte[] arrBytes)
     {
        if (arrBytes == null || arrBytes.Length < 1)
            return default(T);

        BinaryFormatter binForm = new BinaryFormatter();

        //Whatever object you are trying to Deserialize it too
        T obj = (T)binForm.Deserialize(new MemoryStream(arrBytes));

        return obj;
     }