System.Web.XmlSiteMapProvider.GetConfigDocument C# (CSharp) Method

		XmlDocument GetConfigDocument (string virtualPath)
		{
			if (String.IsNullOrEmpty (virtualPath))
				throw new ArgumentException ("The siteMapFile attribute must be specified on the XmlSiteMapProvider");
			
			string file = HostingEnvironment.MapPath (virtualPath);
			if (file == null)
				throw new HttpException ("Virtual path '" + virtualPath + "' cannot be mapped to physical path.");
			
			if (String.Compare (Path.GetExtension (file), ".sitemap", RuntimeHelpers.StringComparison) != 0)
				throw new InvalidOperationException (String.Format ("The file {0} has an invalid extension, only .sitemap files are allowed in XmlSiteMapProvider.",
										    String.IsNullOrEmpty (virtualPath) ? Path.GetFileName (file) : virtualPath));
			
			if (!File.Exists (file))
				throw new InvalidOperationException (String.Format ("The file '{0}' required by XmlSiteMapProvider does not exist.",
										    String.IsNullOrEmpty (virtualPath) ? Path.GetFileName (file) : virtualPath));

			ResourceKey = Path.GetFileName (file);
			CreateWatcher (file);
			
			XmlDocument d = new XmlDocument ();
			d.Load (file);

			return d;
		}