Serializing and Deserializing a multi-dimensional array problem?

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C#

// -- Blocks.
[XmlIgnore]
public Block[,] _Blocks{get;set;}

public byte[] _BlocksInStream
{
get
{
BinaryFormatter _Formater = new BinaryFormatter();
MemoryStream _Ms = new MemoryStream();
_Formater.Serialize(_Ms, _Blocks);
return _Ms.ToArray();
}

set
{
BinaryFormatter _Formatter = new BinaryFormatter();
byte[] _Array = value;
_Blocks = (Block[,])_Formatter.Deserialize(new MemoryStream(_Array));
}
}

This does not seem to work, well, the serialziation work, but I get a null back.
Also, I read this out using the XML Serializer.