When i delete the saved exel sheet from hard (saved from asp.net C#) show the file locked u cannot delete it!!

Its possible the asp.net dll file is still connecting to the sheet...which means you did not properly close the file when saving out...You can delete the file if you really want by stopping the asp.net dll....you can likely spot it in your Task Manager (running processes) and kill asp.net....dont worry by killing it here it will restart up again when you run in Visual Studio again....doing this will free up the excel file to be deleted