I Want To Keep A Separate File For Each And Every Employee In My Program. In My Program I Will Store Details About Employees. I'm Creating A Random Number As Employee-Number. And I Want To Set The File Name To That Employees Employee-Number.I Know How To Create A Text File And Stuff. This I What I Have In My Mind.
You should look up converting an int into a string.
Also getting a random number is a bad idea as it leaves the possibility of multiple employees having the same ID.
You could do this, but it would require checking all employees each time you add one. I'd just start at 1 and just add 1 every time you add a new employee.