Set the background color of an individual dataGridView cell
Yes, you can set the background color of the individual cells in the same place where you set the ReadOnly property.
This should be placed in the Form_Shown event handler in order for it to take effect immediately.
set dataGridView1::Rows[sub-1]::Cells["Amount"]::ReadOnly to true
set dataGridView1::Rows[sub-1]::Cells["Amount"]::Style::BackColor to type Color::Red