Get Today's Transaction From Sql Server Table?

I have a transaction table which has start_date and end_date of datetime datatype.

I am passing date from vb.net application. I wrote following code in vb.net application and query generated was somthing un-expected:

String.Format("SELECT * FROM {0}{1} WHERE {0}tran_date >= '{2}' and {0}tran_date <= '{3}' ;", _Pre, _Table, DateFrom.Date, DateTo.Date)

Here Both DateFrom and DateTo are date variables.

It produced output like:

SELECT * FROM rm07transaction
WHERE
rm07tran_date >= '03/16/2011 12:00:00 AM' and
rm07tran_date <= '03/16/2011 12:00:00 AM'

When i make query to find data of 03/16/2011 they are not populated