[SerializableAttribute()] 
public class PropertyGroup 

class MyPage : System.Web.UI.Page
{
    public void RenderGroupFieldGroups(Dynamicweb.eCommerce.Products.PropertyGroupCollection propertyGroups, Dictionary<string, string> fieldValueDictionary, Dynamicweb.Rendering.Template ParentTemplate)
    {
        if (!ParentTemplate.LoopExists("Groups"))
        {
            return;
        }
        Dynamicweb.Rendering.Template PropertyGroupTemplate = ParentTemplate.GetLoop("Groups");

        foreach (PropertyGroup @group in propertyGroups)
        {
            PropertyGroupTemplate.SetTag("Ecom:Product:GroupField.Group.ID", @group.ID);
            PropertyGroupTemplate.SetTag("Ecom:Product:GroupField.Group.Name", @group.Name);
            RenderGroupFieldFields(@group.PropertyFields, fieldValueDictionary, PropertyGroupTemplate);
            PropertyGroupTemplate.CommitLoop();
        }
    }

    public void RenderGroupFieldFields(Dynamicweb.eCommerce.Products.PropertyFieldCollection PropertyFields, Dictionary<string, string> fieldValueDictionary, Dynamicweb.Rendering.Template ParentTemplate)
    {
        if (!ParentTemplate.LoopExists("Fields"))
        {
            return;
        }

        Dynamicweb.Rendering.Template propertyFieldTemplate = ParentTemplate.GetLoop("Fields");
        foreach (PropertyField field in PropertyFields)
        {
            propertyFieldTemplate.SetTag("Ecom:Product:GroupField.Field.ID", field.ID);
            propertyFieldTemplate.SetTag("Ecom:Product:GroupField.Field.Name", field.Label);
            if (field.InputType == Base.ChkInteger(PropertyField.InputTypeEnum.Dato).ToString() || field.InputType == Base.ChkInteger(PropertyField.InputTypeEnum.Datotid).ToString())
            {
                propertyFieldTemplate.SetTag("Ecom:Product:GroupField.Field.Value", DateTime.FromBinary(Base.ChkLong(fieldValueDictionary[field.ID])), Base.GetCulture(true));
            }
            else
            {
                propertyFieldTemplate.SetTag("Ecom:Product:GroupField.Field.Value", fieldValueDictionary[field.ID]);
            }
            propertyFieldTemplate.CommitLoop();
        }
    }
}