Hi all i have been developing an MVC application in my remote desktop  . but while executing the project im getting the following error . And once i deleted the abc.dll in my bin the project get executing but why am i getting the following error frequently

Error 22 Unable to copy file "obj\Debug\abc.dll" to "bin\abc.dll". The process cannot access the file 'bin\abc.dll' because it is being used by another process.