ASP.Net cannot create/shadow copy

Question

I get this error repeatedly when developing ASP.Net applications:

  Cannot create/shadow copy \'XXXXX\' when that file already exists

Where

Answer 1

Add these lines in the pre-build event command line, which basically unlocks the DLL within Visual Studio:

 IF EXIST $(TargetPath).LOCKED  (del $(TargetPath).LOCKED)
  ELSE (IF EXIST $(TargetPath) (move $(TargetPath) $(TargetPath).LOCKED))

Re-compile and your unable to copy DLL error will not occur.