Share Email Facebook Twitter LinkedIn MEPSystem.IsValid Property Indicates if the system is valid or not. atom AtomValidateSystem default false Namespace: Autodesk.Revit.DBAssembly: RevitAPI (in RevitAPI.dll) Version: 26.4.0.0 (26.4.0.0) Syntax C# public bool IsValid { get; }Property ValueBoolean See AlsoReferenceMEPSystem ClassAutodesk.Revit.DB Namespace