给DatagridView 设置 列和行 的标题背景色 怎么没有效果？？？？？

Question

给DatagridView 设置 列和行 的标题背景色 怎么没有效果？？？？？
        foreach (DataGridViewRow  row in dataGridView1.Rows )
                {
                    if (Convert.ToInt32(row.Cells["Emp_Age"].Value) < 18 && Convert.ToInt32(row.Cells["Emp_Age"].Value)>=1)
                     {
                         row.HeaderCell.Style.BackColor = Color.Red;
                         row.Cells["Emp_Age"].Style.BackColor = Color.Red;
                         dataGridView1.Columns[row.Cells["Emp_Age"].ColumnIndex].HeaderCell.Style.BackColor = Color.Red;
                         row.Cells["Emp_Age"].Style.Font = new Font(dataGridView1.Font, FontStyle.Bold);
                         row.Cells["Emp_Age"].Style.Alignment = DataGridViewContentAlignment.MiddleRight;                     }
                } 高手指点！！！！ 

Answer 1

你是在哪个事件里写的？
 private void dataGridView1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
        {
            this.dataGridView1.ColumnHeadersDefaultCellStyle.BackColor = Color.Red;
        }
//改变标题栏颜色