The Revision number of this revision. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2015 
Syntax
Remarks
 Note that this field is only available if the RevisionSettings are set to number revisions PerProject. When Revisions are numbered PerSheet, a given Revision may display a different RevisionNumber on each sheet. In this case, the revision number can be obtained by calling  [!:Autodesk::Revit::DB::ViewSheet::GetRevisionNumberOnSheet()]  . 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions InvalidOperationException | This operation is not valid for when the revision numbering is per sheet. |