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A quick Google or Bing search for 'old_app_code' will give you some workarounds.
- Put the class back into the old_app_code folder
- rebuild the project to see if it is Ok again
- Copy all of the content of the class to something like notepad
- right-click on the old_app_code folder and select 'Remove from project'
- try building again, you should no longer receive the error message you had earlier, but should now get method not found errors
- create a new Class where you want it to be, and then copy the important bits from notepad (don't forget the namespace)