[DefaultMemberAttribute("Item")] 
[SerializableAttribute()] 
public class PropertyProductValueCollection : System.Collections.ObjectModel.Collection<PropertyProductValue> 

class MyPage : System.Web.UI.Page
{
    public void RenderFieldGroups(Product product, Dynamicweb.Rendering.Template template)
    {
        PropertyProductValueCollection propertyValues = PropertyProductValue.getPropertyProductValues(product);

        //Get types, groups, and fields from valueCollection
        Dictionary<string, object> typeIDs = new Dictionary<string, object>();           
        Dictionary<string, string> propertyValueDictionary = new Dictionary<string, string>();

        foreach (PropertyProductValue propertyValue in propertyValues)
        {
            //Type
            if (!typeIDs.ContainsKey(propertyValue.TypeID))
            {
                typeIDs.Add(propertyValue.TypeID, null);
            }

            //Dictionary containing link between field and value
            if (!propertyValueDictionary.ContainsKey(propertyValue.FieldID))
            {
                propertyValueDictionary.Add(propertyValue.FieldID, propertyValue.Value);
            }
        }

        PropertyTypeCollection propertyTypes = PropertyType.getPropertyTypes(typeIDs.Keys);

        //Render all the values without loops
        RenderGroupFieldsValues(propertyTypes, propertyValueDictionary, template);

        //Render all the values inside 3x loops (type, group, field)
        RenderGroupFieldTypes(propertyTypes, propertyValueDictionary, template);
    }

    private void RenderGroupFieldsValues(Dynamicweb.eCommerce.Products.PropertyTypeCollection Types, Dictionary<string, string> propertyValueDictionary, Dynamicweb.Rendering.Template ParentTemplate)
    {
        //TODO: insert your code here
    }
    private void RenderGroupFieldTypes(Dynamicweb.eCommerce.Products.PropertyTypeCollection Types, Dictionary<string, string> propertyValueDictionary, Dynamicweb.Rendering.Template ParentTemplate)
    {
        //TODO: insert your code here
    }
}