Check if there are any unused files in the project, remove them, clean them, and restart VS2010.
If you still cannot solve it, please refer to: http://stackoverflow.com/questions/2762930/vs2010-always-thinks-project-is-out-of-date-but-nothing-has-changed
Delete both the debug and release directories.
Check if there are any unused files in the project, remove them, clean them, and restart VS2010.
If you still cannot solve it, please refer to: http://stackoverflow.com/questions/2762930/vs2010-always-thinks-project-is-out-of-date-but-nothing-has-changed
Clear Solution