Share Email Facebook Twitter LinkedIn VertexPair.First Property Identifies the first index of VertexPair. Namespace: Autodesk.Revit.DBAssembly: RevitAPI (in RevitAPI.dll) Version: 26.2.0.0 (26.2.0.0) Syntax C# public int First { get; set; }Property ValueInt32 See AlsoReferenceVertexPair ClassAutodesk.Revit.DB Namespace