Tile and TileType

struct Tile
{
    short typeId;
    public TileType Type
    {
        get
        {
            return TileType.Get(typeId);
        }
        set
        {
            typeId = value.Id;
        }
    }
}

class TileType
{
    //you may want to encapsulate these
    public int Id;
    public string Name;
    public Texture2D Texture;
    public Rectangle TextureSource;
    public bool IsObstacle;


    static List<TileType> types;
    static TileType()
    {
        types = new List<TileType>();
        var type = new TileType();
        type.Name = "Dirt";
        //initialize here

        types.Add(type);
    }

    public static TileType Get(int id)
    {
        return types[id];
    }
}