Progressbar in datagridview

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C#3.0

C#

Hi,

I have a form(windows) with one button,one timer control and gridview control and one of the column of datagridview taken as progressbar column.

what i have done is:
when i click on the button, the timer will start and i set interval is(5 seconds) after 5 seconds the progressbar in one column will show to 5% and after 10 seconds the progressbar will results in 10%...e.t.c...
up to 100%...

what my requirement is:-
suppose the progressbar is in the middle ex:-50%
if i again click on the button the timer has to start and progressbar should results 5%....10%....e.t.c...

like this i want to do multiple things...

This is in windows application...(c#.net3.0)

Regards,
Nagaraju.N