在Gridview如何进行每行单元格比较

有在论坛上看到一个问题，就是在Gridview控件中，需要对几个列的数值进行比较，原问题如下：

 

先在数据库中准备数据：

 

CREATE TABLE [dbo].[RecordTime]
(
    Id INT IDENTITY(1,1) PRIMARY KEY,
    Time1 DATETIME,
    Time2 DATETIME,
    Time3 DATETIME,
    Time4 DATETIME
)
GO
INSERT INTO [dbo].[RecordTime] VALUES ('2015-05-11 09:48','2015-05-20 10:08','2015-05-13 14:48','2015-05-19 08:48'),
                                      ('2015-05-10 14:48','2015-05-01 10:02','2015-05-20 12:48','2015-05-20 10:20'),
                                      ('2015-05-20 10:31','2015-05-03 10:40','2015-05-14 10:40','2015-05-25 09:48')
  GO

 CREATE PROCEDURE [dbo].[usp_RecordTime_GetAll]
 AS
    SELECT [Id],[Time1],[Time2],[Time3],[Time4] FROM [dbo].[RecordTime]
GO

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