Share Email Facebook Twitter LinkedIn ContextualHelp.HelpTopicUrl Property The help topic URL.Namespace: Autodesk.Revit.UIAssembly: RevitAPIUI (in RevitAPIUI.dll) Version: 25.3.0.0 (25.3.0.0) Syntax C# public string HelpTopicUrl { get; set; }Property ValueString RemarksApplies only to objects of type ContextualHelpType.ChmFile. If empty or null, the default page of the help file will be displayed. See AlsoReferenceContextualHelp ClassAutodesk.Revit.UI Namespace