C#（Wince） 序列化Dataset问题？

ce上，反序列化。 
public static object ByteAToObject(byte[] binaryData)
        {
            MemoryStream ms = null;
            object obj = null;
            try
            {
                //  反序列化  
                ms = new MemoryStream(binaryData);
                ms.Position = 0;
                CompactFormatter.CompactFormatter ser = new CompactFormatter.CompactFormatter();
                obj = ser.Deserialize(ms);
            }
            catch (Exception e)
            {
                MessageBox.Show(e.ToString(), "错误");
            }
            finally
            {
                ms.Close();
            }
            return obj;
        } 主机上序列化：
public static byte[] ObjectToByteA(object obj)
        {
            using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
            {
                try
                {
                    CompactFormatter.CompactFormatter ser = new CompactFormatter.CompactFormatter();
                    ser.Serialize(ms,obj);        //这里出错。。      
                    byte[] buffer = ms.ToArray();
                    return buffer;
                }
                catch (Exception e)
                {
                    MessageBox.Show(e.ToString(), "错误");
                }
                finally
                {
                    ms.Close();
                }
                return null;
            }
        }  错误提示：Message = "Unable to serialize System.Data.DataSet type, it's not ed with Serializable attribute and no surrogate or overriders are registered for it"
请教各位达人了！