The Excel process won't close until your app closes. You could go through the pain of coding a subroutine that forces the process closed, but there is no reason for it. You might want to consider setting up a global Excel object for the duration of your application. That way, the resources you use in Excel are available at any time and you only keep on instance of it open. When your application quits, so does Excel. RageInTheMachine9532

You have to force garbage collection to clean everything up. Check out this link http://discuss.develop.com/archives/wa.exe?A2=ind0108C&L=DOTNET&D=0&m=19532&P=70662[^] or http://support.microsoft.com/default.aspx?scid=http://support.microsoft.com:80/support/kb/articles/q266/0/88.asp&NoWebContent=1[^]