How to set the background color for an entire column(indication for Readonly column) in datagridview in c#.net

Question

I have a datagridview in which I want to set readonly to true for two columns. I want to change the color for those columns. Whenever I leave from the cell I'm able to make only the first cell and current cell change color. Remaining cells are not working. Can any one help me with this?

Answer 1

try

private void dataGridView2_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
    if (e.ColumnIndex == 0)
        if (dataGridView2[e.ColumnIndex, e.RowIndex].ReadOnly)
            e.CellStyle.BackColor = Color.Red;

    if (e.ColumnIndex == 1)
        if (dataGridView2[e.ColumnIndex, e.RowIndex].ReadOnly)
            e.CellStyle.BackColor = Color.Black;
}