Access body element from content page via a nested master page

Question

All I want to do is access the element from the code-behind of a content page and add a class name to it.

I have a top-level master page with t

Answer 1

once you have set runat="server" for your body node, you have to access it using the HTMLControls namespace. try this.

public void Page_Load(Object sender, EventArgs e)
{ 
//Inject onload and unload
HtmlGenericControl body = (HtmlGenericControl)Master.FindControl("bodyNode");
body.Attributes.Add("class", "home-page");   
}

EDIT
Your problem is that you have nested master pages.

Since the "body" tag is in your top level master page, Master.FindControl() won't work, as that is looking in the nested master page.

What you need to do is use Master.Master.FindControl(), or recursively loop through your master pages, going up until Master.Master is null (as then you know you are at the top level master page) and then calling FindControl() on that.