How do you dynamically assign a Master Page?

Question

Is it possible to assign a Master Page dynamically?

Answer 1

Assign the master page in PreInit of the page whos MasterPage you wish to dynamically set:

protected void Page_PreInit(Object sender, EventArgs e)
{
    this.MasterPageFile = "~/YourMaster.master";
}

Answer 2

You can assign the master page during the Page_PreInit by using the MasterPageFile property.

Me.MasterPageFile = "~/masterpage.master"