Gets the document header for the page if the head element is defined with a runat=server in the page declaration.
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The Page.Header property gets a reference to an System.Web.UI.HtmlControls.HtmlHead object that you can use to set document header information for the page. The System.Web.UI.HtmlControls.HtmlHead allows you to add information such as style sheets, style rules, a title, and metadata to the head element.
Adding styles programmatically using the methods of the System.Web.UI.IStyleSheet interface during asynchronous postbacks is not supported. When you add AJAX capabilities to a Web page, asynchronous postbacks update regions of the page without updating the whole page. For more information, see ASP.NET AJAX Overview.