[2008] Freeze the last row of a datagridview

Hello, I have and unbound datagridview to display some results. I need to freeze the last row to display a total/sum. Can I do this? If I write:

vb Code:

datagridview1.rows(datagridview1.rows.count-1).frozen=true

then all rows are frozen...

I am using VS 2008 but not using .NET Framework 3.5, I use .NET 2.0

Thanks in advance!