Getting error and warning in window application in C# VS

Question

Hello Friends i am creating window apps when when run my program getting error and warning below   Warning 4 Could not copy "obj\Debug\Demo App.exe" to "bin\Debug\Demo App.exe". Beginning retry 4 in 1000ms. The process cannot access the file 'bin\Debug\Demo App.exe' because it is being used by another process. Demo App    Error 12 Unable to copy file "obj\Debug\Demo App.exe" to "bin\Debug\Demo App.exe". The process cannot access the file 'bin\Debug\Demo App.exe' because it is being used by another process. Demo App     how to resolve please help me out.     Thanks in advance

John Iwasz · Answer

There could be a number of causes. You could have a running instance of Demo App.exe on your system. Open Task Manager and look for that instance name and terminate it.   If that doesn't resolve it, then clean the solution using Build->Clean Solution.   If that still doesn't resolve it, close Visual Studio. Delete the contents of your obj and bin directories and reopen Visual Studio.