Get Excel Files To Sql2008

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C#3.0

C#

I hava a excel file ,the sheet1 format like this
A B C D E F G H I
1 02:00
2 16:00
3 h3
4 0.124
5 0.234

The E1 && E2 cells format is datetime ,but the E3,E4,E5 is string,
when i using oledb connector read this sheets to database ,the data format convert was error like this
a b c d e
02:00
16:00
NULL
1899/01/01 01:24
1899/01/01 02:34

the connectionstring is
Provider=Microsoft.ACE.OLEDB.12.0;Data Source=F:\XBoxProgram\MESD\DataFormat\CH350-40023 _16.00_H5-H6.xls;Extended Properties="EXCEL 12.0;HDR=NO;IMEX=1";
I hava IMEX=1,but i can't hava real data to database
How Can i get real data to database?
the excel files was Excel2007 sava as Excel97-2003