Please help! Need summary row for DataGrid

[MrNobody]

I am desperately in need of some help to get a summary row for my DataGrid. A
summary row is just a row always on the bottom which has totals for certain
columns.
I have been able to find tutorials online that show exactly how to
accomplish this using the Web UI DataGrid in ASP.net, but unfortunately the
DataGrids are simply not the same- the Windows.Forms DataGrid does not have a
footer you can use like the Web UI one has

So far the only solution that I have tried was to make another DataGrid,
with onyl one row and the same column styles as the first one, and have it
show the totals for the main DataGrid. this solution is looking more and more
difficult because for one, I cannot do a parent/child relation- what columns
would I use? SO then I'd have to do a manual loop through and add up the
data. There's got to be a better way...