Error Message
Moving a [type | member | parameter | constraint | using] will prevent the debug session from continuing while Edit and Continue is enabled
This error indicates that you tried to move a type, member, parameter, constraint, or using statement; which Edit and Continue does not support while debugging.
For example, consider the following code:
class Example
{
   int pooh;
   int bear;
   static void Main() { }
}
If you step into Main, then try to cut bear and paste it above the pooh declaration, an error occurs.
To correct this error
- Choose Undo from the Debug menu to undo the changes. - –or– 
- On the Debug menu, click Stop Debugging, then make the changes, and start a new debugging session. 
See Also
Reference
using (C# Reference)
Supported Code Changes (C#)
Edit and Continue (Visual C#)
Other Resources
Types (C# Reference)
Edit and Continue Errors and Warnings (C#)