public static Uri ConstructHelpRenderingUrlWithQualifierHelpId(string appQualifier, string helpId) { if (string.IsNullOrEmpty(appQualifier)) { return(null); } if (string.IsNullOrEmpty(helpId)) { return(null); } return(new Uri(string.Format(HelpProvider.GetBaseUrl().ToString(), appQualifier, helpId))); }