Compiler Warning (level 1) C4657
Error Messageexpression involves a data type that is new since the last build
You added or changed a data type, making it new to your source code since the last successful build. Edit and Continue does not support changes to existing data types.
To remove this warning without ending the current debug session
Change the data type back to its state prior to the error.
From the Debug menu, choose Apply Code Changes.
To remove this error without changing your source code
From the Debug menu, choose Stop Debugging.
From the Build menu, choose Build.