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C# Edit and Continue: error 4009 

Error Message

Updating a [using alias | field | event | fixed size buffer | constant | attribute] will prevent the debug session from continuing while Edit and Continue is enabled

This error indicates that you tried to modify a using alias, field initializer, attribute target, or attribute arguments.

Consider the following example code:

class Program

{

   private int Example = 10;

   static void Main() { }

}

If you step into the application, then try to change the Example = 10 to Example = 20, the error occurs.

To correct this error

  • Undo the changes, then continue debugging without the changes

    -or-

    On the Debug menu, click Stop Debugging, make the changes, then start a new debugging session.

See Also

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