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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.
Example: set dataGridView1::Rows[sub-1]::Cells["Amount"]::ReadOnly to true set dataGridView1::Rows[sub-1]::Cells["Amount"]::Style::BackColor to type Color::Red