DNN DDR Razor menu template with level checking

template.cshtml

@using DotNetNuke.Web.DDRMenu;
@using System.Dynamic;
@inherits DotNetNuke.Web.Razor.DotNetNukeWebPage<dynamic>

@helper RenderNodes(IEnumerable<MenuNode> nodes, int level)
{
    if (nodes.Any())
    {
        var dropdown = level == 0 ? "nav navbar-nav" : "dropdown-menu";
        var topLevelId = level == 0 ? Model.ControlID : null;

        <ul id="@topLevelId" class="@dropdown">
        @foreach (var node in nodes)
        {
            var cssClasses = new List<string> { "level-" + level };
            if (node.HasChildren())
            {
                if (level == 0) { cssClasses.Add("dropdown"); } else { cssClasses.Add("dropdown-submenu"); }
            }
            
            cssClasses.Add("node-" + node.TabId);
            if (node.Selected) { cssClasses.Add("active"); }
            var classes = new HtmlString((cssClasses.Count == 0) ? null : string.Join(" ", cssClasses)));

            <li class="@classes">
                
                @if (node.HasChildren())
                {
                    if (level == 0)
                    {
                        if (node.Enabled)
                        {
                            <a href="@node.Url" target="@node.Target" class="dropdown-toggle" >@node.Text <b class="caret"></b></a>
                        }
                        else
                        {
                            <a class="dropdown-toggle">@node.Text <b class="caret"></b></a>
                        }
                    }
                    else
                    {
                        <a href="@node.Url" target="@node.Target">@node.Text <b class="caret"></b></a>
                    }
                    @RenderNodes(node.Children, level + 1)
                }
                else if (node.Enabled)
                {
                    <a href="@node.Url" target="@node.Target">@node.Text</a>
                }
                else
                {
                    @node.Text
                }

                
            </li>
        }
        </ul>
    }
}

<div class="nav-wrap">
    @RenderNodes(Model.Source.root.Children, 0)
</div>

Hi, I have tried to use this template but menu doesn't show. Actually when I add just "int level" it doesn't show. I use dnn 7.2.2. What can be wrong? I am trying to render ul/li for sub items and set classes to them.