how to compare the time and date using mysql and c#

Problem :

I have a table logout with columns

logout_datetime  values format like this(2011-09-08 11:09:09)

and i want to compare the logout_datetime with today date and time also....

for that i have done like this....

string dtStartString = DateTime.Today.ToString("yyyy-MM-dd");
string timeonly = DateTime.Now.ToShortTimeString();

string sql = @"select logout_id"; 
sql+= string.Format("where logout_datetime = '{0}'",dtStartString );

but it will compares only date in logoutdatetime ,its wrong i want to compare the time also

how can i do this..

would any one pls help on this...

Solution :

Of course your code is only comparing the date because you are passing only dtStartString which does not have a time part.

try to pass this:

string dtStartString = DateTime.Now.ToString("yyyy-MM-dd  HH:mm:ss");

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