From a Razor newbie... Why does this function call work:

@RenderChildren(node.Children.Where("NodeTypeAlias == @0 or NodeTypeAlias == @1 and Visible", "FP_Page", "FP_Home"));

whereas this does not:

dynamic children = node.Children.Where("NodeTypeAlias == @0 or NodeTypeAlias == @1 and Visible", "FP_Page", "FP_Home");                 

RenderChildren(children); 

Am i doing something wrong?  Declaring the variables wrong perhaps?

I dont get an error or anything, it just doesnt call the function in the second case... the entire code block & helper function looks like this:

@helper RenderNodes(dynamic nodes)
{
    foreach (var node in nodes)
    {
        var selected = Array.IndexOf(Model.Path.Split(','), node.Id.ToString()) >= 0 ? " class=\"current\"" : "";

        <li>
            <a @Html.Raw(selected) href="@node.Url" title="@node.Name" >@node.Name</a>
             @RenderChildren(node.Children.Where("NodeTypeAlias == @0 or NodeTypeAlias == @1 and Visible", "FP_Page", "FP_Home"));
@*            @{
                dynamic children = node.Children.Where("NodeTypeAlias == @0 or NodeTypeAlias == @1 and Visible", "FP_Page", "FP_Home");
                RenderChildren(children);
            }
*@        </li>
    }
}

@helper RenderChildren(dynamic childNodes)
{
    <p>children: @childNodes.Items.Count</p>
        <ul>
            @foreach (dynamic node in childNodes)
            {
                var selected = Array.IndexOf(Model.Path.Split(','), node.Id.ToString()) >= 0 ? " class=\"current\"" : "";
                <li><a @Html.Raw(selected) href="@node.Url" title="@node.Name" >@node.Name</a></li>
            }
        </ul>  
}