C# Edit and Continue: error 4010 

Error Message

Updating the modifiers of a [type | member | parameter modifier] will prevent the debug session from continuing while Edit and Continue is enabled

This error indicates that you tried to edit the modifiers of a type, member, or parameter modifier, which cannot be changed while debugging. This may include:

• Changes to accessibility.

• Addition or removal of abstract, virtual, sealed, unsafe, partial, override, new, static for types and members.

• Changes to ref, out, and params for parameters.

For example, consider the following code:

internal class Program

{

   static void Main(string[] args) {}

}

If you step into Main, then change internal to public, this error occurs.

To correct this error

• Choose Undo from the Debug menu to undo the change.

  –or–

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

See Also

Reference

Supported Code Changes (C#)
Edit and Continue (Visual C#)

Other Resources

Edit and Continue Errors and Warnings (C#)