Gets or sets the URL of the page that the System.Web.SiteMapNode object represents.
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The System.Web.XmlSiteMapProvider class, which is the default site map provider implementation for ASP.NET, uses the SiteMapNode.Url property as a lookup key. Therefore, any System.Web.SiteMapNode object that is used by the System.Web.XmlSiteMapProvider class must have a unique URL within the scope of the provider.
Leading and trailing white-space characters are ignored.