Adds users back to the list of displayed users and permits customization of the graphics. Any usernames that are not currently removed will be ignored. Returns the number of users who were actually restored. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2012 
Syntax
| C# | 
|---|
|  | 
| Visual Basic | 
|---|
|  | 
| Visual C++ | 
|---|
|  | 
Parameters
- usersToRestore
-  Type:  System.Collections.Generic ICollection   String  
 The usernames of the users to restore. Any usernames that are not currently removed will be ignored.
Return Value
The number of usernames that were actually restored.Remarks
 This is the opposite of removing users. Note that the user will be shown with default graphic overrides - any customizations that existed prior to removing the user will not be restored. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL |