一个Hashtable序列化进数据库后取出

大家帮忙看看，报错“在分析完成之前就遇到流结尾。”
序列化：
  public bool Serialization(Hashtable hashtable)
    {
        BinaryFormatter binaryFormatter = new BinaryFormatter();
        System.IO.MemoryStream ms = new System.IO.MemoryStream();
        binaryFormatter.Serialize(ms, hashtable);//内存流二级制序列化
        ms.Position = 0;
        byte[] b = new Byte[ms.Length];
        ms.Read(b, 0, b.Length);
        bool flag = new Product().ss(b);
        ms.Close();
        return flag;

    }

下面是反序列化：
byte[] b = new Product().returnSeirazation();//数据库返回
         System.IO.MemoryStream ms = new System.IO.MemoryStream(b);
         BinaryFormatter binaryFormatter = new BinaryFormatter();
         ms.Position = 0;
         Items =(Hashtable)binaryFormatter.Deserialize(ms);//报错在分析完成之前就遇到流结尾。”
         ms.Close(); --------------------编程问答-------------------- 结贴率太低！ --------------------编程问答--------------------

        /// <summary>

        /// 序列化发送消息

        /// </summary>

        /// <param name="request"></param>

        /// <returns></returns>

        public static byte[] SerializeBinary(object request)

        {

            System.Runtime.Serialization.Formatters.Binary.BinaryFormatter serializer =

            new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();

            System.IO.MemoryStream memStream = new System.IO.MemoryStream();

            serializer.Serialize(memStream, request);



            //byte[] b = memStream.GetBuffer();

            byte[] b = memStream.ToArray();

            memStream.Close();

            return b;

        }



        /// <summary>

        /// 反序列化接收消息

        /// </summary>

        /// <param name="buf"></param>

        /// <returns></returns>

        public static object DeserializeBinary(byte[] buf)

        {

            if (buf == null || buf.Length == 0) return null;

            System.IO.MemoryStream memStream = new System.IO.MemoryStream();

            memStream.Write(buf, 0, buf.Length);

            memStream.Position = 0;

            System.Runtime.Serialization.Formatters.Binary.BinaryFormatter deserializer =

            new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();

            object newobj = deserializer.Deserialize(memStream);

            memStream.Close();

            return newobj;

        }

--------------------编程问答-------------------- 检查序列化文件
IFormatter ff = new BinaryFormatter();
stream.Seek(0, SeekOrigin.Begin);
object obj = ff.Deserialize(stream);
--------------------编程问答-------------------- --------------------编程问答--------------------

补充：.NET技术 ,  ASP.NET