grid view functunality ?

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.DataRow )
            {
              
                double salary=0.0;
               salary= double.parse(e.Row.Cells[1].Text;
                if (salary>=5000)
                {
                    //highlight row or cell here
                    e.Row.Cells[1].BackColor=System.Drawing.Color.Red ;
                    //e.Row.BackColor=System.Drawing.Color.Red ;
                 
                }
            }
        }