在Gridview如何进行每行单元格比较

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Insus.NET;
using System.Data;
using System.Drawing;

public partial class _Default : System.Web.UI.Page
{
RecordTime rt = new RecordTime();
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
Data_Binding();
}

private void Data_Binding()
{
this.GridView1.DataSource = rt.GetRecordTime();
this.GridView1.DataBind();
}

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType != DataControlRowType.DataRow) return;

DataRowView drv = (DataRowView)e.Row.DataItem;
List<DateTime> lDT = new List<DateTime>();
lDT.Add(Convert.ToDateTime(drv["Time1"]));
lDT.Add(Convert.ToDateTime(drv["Time2"]));
lDT.Add(Convert.ToDateTime(drv["Time3"]));
lDT.Add(Convert.ToDateTime(drv["Time4"]));
DateTime dt = lDT.Max<DateTime>();
int i = lDT.IndexOf(dt);

int actualIdx = i + 1;

e.Row.Cells[actualIdx].ForeColor = Color.FromName("red");
}
}