DataGridView CellFormatting Event

[NvrBst]

How does "e.CellStyl e" work?

When I do something like
if(e.ColumnInde x == 0 && e.RowIndex == 0)
DataGridView.Ro ws[0].DefaultCellSty le.BackColor = Color.Orange;

then the entire table goes orange; not just the 1st row. When I do
if(e.RowIndex == 0) e.CellStyle.Bac kColor = Color.Orange;

then 1st row goes orange only. Is it better to set the
"DefaultCellSty le" for a row in the "CellFormatting " event handler or
is that way of thinking wrong and just use "e.CellStyl e".

I ask that because when I interate through the entire table in a load
event (not using CellFormating Event)
"DataGrideV iew[i,ii].DefaultCellSty le.BackColor = Color.Orange;" then
it takes about 25 seconds. Making "DataGridViewCe llStyle cstyle = new
DataGridViewCel lStyle(); cstyle.backcolo r = color.orange;" with the
interation method brings it down to 3 seconds.

But for the "CellFormatting " event, using the "e.CellStyle.Ba ckColor =
color.orange" takes about 3 seconds, and making a global "cstyle" and
doing "e.CellStyl e = cstyle;" still takes 3 seconds. Does
CellFormating event automatically reuse a "DataGrideViewC ellStyle"
object thus I don't have to do it myself. And is this resuing
property the reasion why my entire table goes orange when i do
"DataGridView.R ows[0].DefaultcellSty le.BackColor = Color.Orange;" for
the 1st cell, in the CellFormating event handler method?
:) Thanks Again again for your time. I've asked a lot of DataGridView
questions today already.

NB