Serialization with GZipStream problem

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C#

I am working with some legacy code that serializes some data to a database and reads the data back and deserializes it. I know the deserialization works correctly because I can read the old data in the database. However, if I save new data then try to read it back I get a SerializationException, "Binary stream '0' does not contain a valid BinaryHeader.". I have created some test code with just the serialization/deserialization code and have successfully reproduced the problem. I believe something was accidentally changed in the serialization section to cause it to not work with the deserialization section. Unfortunately, the old code is not available in our source control for comparison and the person who wrote it no longer works for the company. I suspect the gzip part of the serialization section is wrong, but I can’t figure out what it should be. The serialization/deserialization code is below. The line "table = (Dictionary<int,>>>)bf.Deserialize(gz);" is where the SerializationException occurs. I am using Visual Studio 2013 and .NET 4.5.

Dictionary<int, Dictionary<double, List<double>>> Table;

//For brevity I have left out the code for loading data into Table.
//However, I have confirmed that the data is being correctly loaded into Table.


            #region serialize data

            System.Data.Linq.Binary serializedData;
            using (var ms1 = new MemoryStream())
            {
                var bf = new BinaryFormatter();
                bf.Serialize(ms1, Table);

                using (var ms2 = new MemoryStream())
                {
                    using (var gz = new GZipStream(ms2, CompressionMode.Compress))
                    {
                        var data = ms1.GetBuffer();
                        gz.Write(data, 0, data.Length);
                        serializedData = ms2.GetBuffer();
                    }
                }
            }
 
            #endregion serialize data


            #region deserialize data

            Dictionary<int, Dictionary<double, List<double>>> table;

            using (var ms = new MemoryStream(serializedData.ToArray()))
            {
                using (var gz = new GZipStream(ms, CompressionMode.Decompress))
                {
                    var bf = new BinaryFormatter();
                    table = (Dictionary<int, Dictionary<double, List<double>>>)bf.Deserialize(gz);
                }
            }

            #endregion deserialize data