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void Application_PreRequestHandlerExecute(object src,EventArgs e)
{
    Page page=this.Context.Handler as Page;
    if(page!=null)
    {
       page.PreInit+=new EventHandler(page_PreInit);
    }
}
void Page_PreInit(object sender,EventArgs e)
{
    Page page=this.Context.Handler as Page;
    if(page!=null)
    {
       page.Theme="MyTheme";
    }
}
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