Identifies if the object is read-only or modifiable. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 17.0.0.0 (17.0.1090.0) 
Syntax
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Field Value
If true, the object may not be modified. If false, the object's contents may be modified.Examples
Document project = uiApplication.ActiveUIDocument.Document;
Settings settings = project.Settings;
TaskDialog.Show("Revit","Categories: " + settings.Categories.IsReadOnly.ToString()); Dim project As Document = uiApplication.ActiveUIDocument.Document
Dim settings As Settings = project.Settings
TaskDialog.Show("Revit", "Categories: " + settings.Categories.IsReadOnly.ToString())