How to close an Excel process by itself

Dim FN As String = Server.MapPath("\esmp\temp\" & Session.SessionID & ".xls")
Dim xl As New Excel.Application
Dim wk As Excel.Workbook = xl.Workbooks.Add()
xl.Cells(2, 2) = "its ok"
wk.Close(SaveChanges:=True, FileName:=FN)
wk = Nothing
xl.Quit()
xl = Nothing
-------------------------------
that was the coding I wrote in the button click event. It does work fine...but it is creating a separate process every time, the event is fired...and the process from task manager could not get deleted automatically. If I click on button 5 times....5 processes named as "EXCEL.EXE" are staying in the processes of TaskManager.

So, How to make the process to close byitself after the completion of its work.

The COM object has not been released properly.
Microsoft suggest this solution using the
System.Runtime.InteropServices.Marshal.ReleaseComObject method.

VB Code:

Private Sub yoursub()
Dim FN As String = Server.MapPath("\esmp\temp\" & Session.SessionID & ".xls")
Dim xl As New Excel.Application
Dim wk As Excel.Workbook = xl.Workbooks.Add()
xl.Cells(2, 2) = "its ok"
wk.Close(SaveChanges:=True, FileName:=FN)
wk = Nothing
xl.Quit()
 
'use the NAR sub to release COM object
NAR(xl)
End Sub
 
 Private Sub NAR(ByVal o As Object)
            '* Procedure: NAR
            '* Author: Microsoft
            '* Description:  This sub cleanly releases the COM Automation Object.
            '* Source: [url]http://support.microsoft.com/?kbid=317109[/url]
 
            Try
                System.Runtime.InteropServices.Marshal.ReleaseComObject(o)
            Catch
            Finally
                o = Nothing
            End Try
        End Sub

Thank you very very much...

I actually know something!

Wow... so thats what it feels like.