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The Page.Master property returns the System.Web.UI.MasterPage object associated with this page. This property is read-only; however, you can set properties on the System.Web.UI.MasterPage object it returns.
The Page.Master property is valid only on pages that reference a master page in the Page.MasterPageFile property. If you access the Page.Master property on a page that does not reference a master page, null is returned. The contents of a master page are not available until after the Page.PreInit event has been raised.