C# Edit and Continue: error 4012
Updating the initializer of a [feld | enum member] will prevent the debug session from continuing while Edit and Continue is enabled
This error indicates that you tried to edit the initializer of either a field, including const, event, or the initializer of an enum member.
For example, consider the following code:
class Program
{
enum Color { Red = 1}
static void Main() { }
}
If you into the application and try to change Red = 1 to Red = 2, this error occurs.
To fix the problem
On the Edit menu, click Undo to undo the changes
-or-
On the Debug menu, click Stop Debugging, make the changes, then start a new debugging session.
See Also
Reference
Constants (C# Programming Guide)