How to convert this c# class to work with Phone 7

The below class contains serializationinfo in it's class definition which does not appear to be supported in Phone 7 development.  What would be an appropriate substitute?

Thanks for your help

Daniel

    [Serializable()]
    class SubDocumentData : ISerializable
    {
        private int _DocumentFileID = 0;
        public int DocumentFileID
        {
            get { return _DocumentFileID; }
            set { _DocumentFileID = value; }
        }

        private string _FileType = string.Empty;
        public string FileType
        {
            get { return _FileType; }
            set { _FileType = value; }
        }

        private int _FileSize = 0;
        public int FileSize
        {
            get { return _FileSize; }
            set { _FileSize = value; }
        }

        private int _DocumentID = 0;
        public int DocumentID
        {
            get { return _DocumentID; }
            set { _DocumentID = value; }
        }

        private DateTime _FileCreatedDate = DateTime.MinValue;
        public DateTime FileCreatedDate
        {
            get { return _FileCreatedDate; }
            set { _FileCreatedDate = value; }
        }

        private string _FileCaption = string.Empty;
        public string FileCaption
        {
            get { return _FileCaption; }
            set { _FileCaption = value; }
        }

        private string _SendFile = string.Empty;
        public string SendFile
        {
            get { return _SendFile; }
            set { _SendFile = value; }
        }

        private byte[] _DocumentImage = null;
        public byte[] DocumentImage
        {
            get { return _DocumentImage; }
            set { _DocumentImage = value; }
        }

        private int _DocumentSizeOnDisk = 0;
        public int DocumentSizeOnDisk
        {
            get { return _DocumentSizeOnDisk; }
            set { _DocumentSizeOnDisk = value; }
        }

        public SubDocumentData()
        {
        }

        public SubDocumentData([b]SerializationInfo[/b] info, StreamingContext ctxt)
        {
            this._DocumentFileID = (int)info.GetValue("DocumentFileID", typeof(int));
            this._FileType = (string)info.GetValue("FileType", typeof(string));
            this._FileSize = (int)info.GetValue("FileSize", typeof(int));
            this._DocumentID = (int)info.GetValue("DocumentID", typeof(int));
            this._FileCreatedDate = (DateTime)info.GetValue("FileCreatedDate", typeof(DateTime));
            this._FileCaption = (string)info.GetValue("FileCaption", typeof(string));
            this._SendFile = (string)info.GetValue("SendFile", typeof(string));
            this._DocumentImage = (byte[])info.GetValue("DocumentImage", typeof(byte[]));
            this._DocumentSizeOnDisk = (int)info.GetValue("DocumentSizeOnDisk", typeof(int));
        }

    
    }
}

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DanielManchesterAsked:
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MikeTooleCommented:
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