Sets a flag indicating whether an updater is optional or not. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2011 
Syntax
| C# | 
|---|
   |  
| Visual Basic | 
|---|
   |  
| Visual C++ | 
|---|
   |  
Parameters
- id
 -  Type:  Autodesk.Revit.DB UpdaterId  
Id of the updater 
- isOptional
 -  Type:  System Boolean  
Use True to make the updater optional, false to make it a mandatory updater. 
Remarks
 This flag controls whether an updater is going to be required next time a document in which it had been used is opened. If a non-optional updater is not found (currently not registered) in a document, the end user will be presented with a warning and choices to resolve the situation. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentException | Updater with this Id is not currently registered in Revit. | 
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL |