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 Specifies whether the .NET object represents a valid Revit entity. 
 Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 25.0.0.0 (25.0.0.0)
 Syntax
 Syntax   Remarks
 Remarks   If the corresponding Revit native object is destroyed, or creation of the corresponding object is undone, a managed API object containing it is no longer valid. API methods cannot be called on invalidated wrapper objects. 
  See Also
 See Also