Сохранение массива объектов

class cell
{
public bool empty;
public int bid=-1;
public int id=-1;
public bool is_breaking=false;
public int durability=0;
public int integrality = 100;
}

[Serializable]
public class Cell
{
    public bool empty;
    public int bid = -1;
    public int id = -1;
    public bool is_breaking = false;
    public int durability = 0;
    public int integrality = 100;
}

static class Helper
{
    public static T[] Flatten<T>(T[,] arr)
    {
        int rows0 = arr.GetLength(0);
        int rows1 = arr.GetLength(1);
        T[] arrFlattened = new T[rows0 * rows1];
        for (int j = 0; j < rows1; j++)
        {
            for (int i = 0; i < rows0; i++)
            {
                arrFlattened[i + j * rows0] = arr[i, j];
            }
        }
        return arrFlattened;
    }
    public static T[,] Expand<T>(T[] arr, int rows0)
    {
        int length = arr.GetLength(0);
        int rows1 = length / rows0;
        T[,] arrExpanded = new T[rows0, rows1];
        for (int j = 0; j < rows1; j++)
        {
            for (int i = 0; i < rows0; i++)
            {
                arrExpanded[i, j] = arr[i + j * rows0];
            }
        }
        return arrExpanded;
    }
    public static void Serialaize<T>(T[,] arr, string path)
    {
        var toSerialize = Helper.Flatten(arr);
        using (var fs = new FileStream(path, FileMode.OpenOrCreate))
        {
            var serealizer = new XmlSerializer(typeof(T[]));
            serealizer.Serialize(fs, toSerialize);
        }
    }
    public static T[,] Deserialaize<T>(string path, int rows = 32)
    {
 
        using (var fs = new FileStream(path, FileMode.OpenOrCreate))
        {
            var serealizer = new XmlSerializer(typeof(T[]));
            var result = (T[])serealizer.Deserialize(fs);
            return Expand(result, rows);
        }
    }

        var cells = new Cell[,] { { new Cell(), new Cell(),new Cell() }, { new Cell(), new Cell() ,new Cell()} };
        Console.WriteLine(cells.GetLength(0) + " " + cells.GetLength(1));
        Helper.Serialaize(cells, "C:/temp/temp.xml");
        cells = null;
        cells = Helper.Deserialaize<Cell>("C:/temp/temp.xml", 2);
        Console.WriteLine(cells.GetType());
        Console.WriteLine(cells.GetLength(0) + " " + cells.GetLength(1));