Grid Header hide and visible and header text change at runtime with RowDataBound event

protected void grid_RowDataBound(object sender, GridViewRowEventArgs e)

    {

        if (e.Row.RowType == DataControlRowType.Header)

        {

            if (Convert.ToString(Session["User"]).ToLower() == "Admin")

            {

                e.Row.Cells[0].Visible = false;

                e.Row.Cells[1].Visible = false;

                e.Row.Cells[6].Visible = true;

                e.Row.Cells[7].Visible = true;

                e.Row.Cells[12].Visible = true;

                e.Row.Cells[13].Visible = true;

            }

            else

            {

                e.Row.Cells[0].Visible = true;

                e.Row.Cells[1].Visible = true;

                e.Row.Cells[6].Visible = false;

                e.Row.Cells[7].Visible = false;

                e.Row.Cells[12].Visible = false;

                e.Row.Cells[13].Visible = false;

                e.Row.Cells[13].Text = "New Text";

            }

        }

   }