Apply a new css class on Product Subcategories Menu

Hi all,

I'd like to apply an extra css class on subcategory menu items. I tried to edit the CategoryNavigation.ascx.cs file but it seems that my actions have no result at all.

I made the following changes:

(line 49)
                if (!String.IsNullOrEmpty(this.LiLeftMargin))
                {
                    writer.WriteAttribute("style", string.Format("margin-left: {0}px", this.LiLeftMargin));
                    writer.WriteAttribute("class", "subcat");
                }


Nothing happens though, as if I hadn't change the code at all. Am I doing something wrong here?
Please help...

did you recompile the solution after you made the changes ?

I edit files locally, recompile CategoryNavigation.ascx.cs and then upload it on server. Do I have to do something more?

You also need to upload \bin\NopCommerceStore.dll assembly to your server

There is no "NopCommerceStore.dll" in /bin directory...

(Thank you for your answer and excuse me for my ignorance. I'm really new to nopcommerce and visual webdeveloper)

(edit)
I finally managed to update files.

I 'm looking for some way to customize code and create a tree-type category list.
The subcategies should not be at the same level of the list with the parent categories.
This is wrong, in my personal opinion.
The code should create a category list like this:

<ul>
  <li>
      Parent Category 1
        <ul>
            <li>Subcategory item 1</li>
            <li>Subcategory item 2</li>
            <li>Subcategory item 3</li>
            <li>Subcategory item 4</li>
        </ul>
    </li>
    <li>
      Parent Category 2
    </li>
    <li>
      Parent Category 3
    </li>
</ul>

Is this possible? Can you help me fix this please?