array["ATM"] = array(
               "PC" => array(
                    "Processor" => array(
                                "CompanyName" => "Name",
                                "Speed" => "2.9 GHz"
                    ),
                    "RAM" => array(
                            "CompanyName" => "GSkill",
                            "Capacity" => "8GB")
                ),
                "Others" => array()
);

public Dictionary<string, dynamic> _LoadData(int id, Dictionary<string, dynamic> data, FormCollection collection)
    {
        var childs = inv_db.inv_meta_data_properties.Where(a => a.parentDataPropertyId == id).ToList();
        if(childs.Count > 0){
         foreach(var child in childs){
             data[child.dataPropertyValue] = _LoadData(child.dataPropertyId, data, collection);
         }
        }else{
            var propItemId = (from map in inv_db.inv_item_property_mapping
                             join prop in inv_db.inv_dic_item_properties on map.itemPropertyId equals prop.itemPropertyId
                             where map.itemId == id && map.status == 1
                             select new
                             {
                                 name = prop.propertyName,
                                 propId = prop.itemPropertyId
                             }).ToList();
            foreach (var value in propItemId) {
                var key = id + "_" + value.propId;
                data[value.name] = collection[key].ToString();
            }
         }

        return data;
    }