Can I change a nested master page's master dynamically?

Question

Okay, so we all know about changing a master page dynamically in a page\'s OnPreInit event.

But what about a nested master page? Can I change a master\'s master?

Answer 1

To add on to the answer of Zhaph - Ben Duguid, (+1 by the way):

Here is example code that sets the master page of the nested master page. All pages inherit from this BasePage, so this code only exists in one place.

public class BasePage : System.Web.UI.Page
{
    private void Page_PreInit(object sender, System.EventArgs e)
    {
        if (Request.Browser.IsMobileDevice)
        {
            if (Page.MasterPageFile == "~/master/nested.master")) 
            {
                Page.Master.MasterPageFile = "~/master/mobile.master";
            } 
            else 
            {
                MasterPageFile = "~/master/mobile.master";
            }
        }
    }
}