How to kill/close an excel process by itself

[jag_chat]

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.

[BrianB]

Where is the button ?
If it is in Excel there is no need to run a separate instance.