datagrid view cell click

Question

hello,


i used datagrid view having columns 11 and rows 10
i used cell click event

 if (dataGridView1[e.ColumnIndex, e.RowIndex].Style.BackColor == Color.Empty)

                dataGridView1[e.ColumnIndex, e.RowIndex].Style.BackColor = Color.Black;// 0x7D0000255;

            else

                dataGridView1[e.ColumnIndex, e.RowIndex].Style.BackColor = Color.Empty;

           but its apply all 11 columns but i want apply this code only 10 columns last 11 columns i use numbers only

help me.