coloring a cell in janus gridex ?

See more:

C#

.NET

i hava agridex janus control.
if i want to highlight a specific cell depend on another one that contain a date if a date is earlier than today how can i do this i wrote this but all cell's color became red

private void gridEX1_FormattingRow(object sender, RowLoadEventArgs e)
   {

       GridEXFormatStyle red = new GridEXFormatStyle();
       red.BackColor = Color.Red;
        GridEXFormatStyle white = new GridEXFormatStyle();
        white.BackColor = Color.White;

       //int i = 1;
       for (int i = 0; i < gridEX1.RowCount; i++)
       {
           DateTime theResult;

           if (DateTime.TryParse(gridEX1.GetRow(i).Cells[9].Value.ToString(), out theResult))
           {

               int compare = DateTime.Compare(theResult, DateTime.Now);
               if (compare == 0 || compare == -1) gridEX1.RootTable.Columns[12].CellStyle = red;
           }
           else gridEX1.RootTable.Columns[12].CellStyle = white;

       }
   }