This topic applies to:
| Visual Studio Edition | Visual Basic | C# | C++ | J# | 
| Express | Yes | No | No | No | 
| Standard | Yes | No | No | No | 
| Pro/Team | Yes | No | No | No | 
Most changes to conditional compilation directives are not allowed while in Edit and Continue mode. Specifically, Edit and Continue does not support the following changes:
- Adding or removing conditional compilation directives. 
- Adding, removing, or changing the evaluation expression of a conditional compilation statement. 
If you want to make one of these changes, you must stop debugging and recompile your project.
See Also
Tasks
How to: Apply Edits in Break Mode with Edit and Continue
Reference
Edit and Continue (Visual Basic): Unsupported Declaration Edits