Problem Inserting Integers And Date In A Sql Server 2005 Datatable Row And Selecting It Afterwards Based On The Date

Hi,
 
I have soma ado.net code that inserts 7 parameters in a database ( a date, 6  integers).
I also use a self incrementing ID but the date is set as primary key because for each series of 6 numbers of a certain date there may only be 1 entry.  Moreover only 1 entry of 6 integers is possible for 2 days of the week, (tue and fr).
I manage to insert a row of data in the database, where the date is set as smalldatetime and displays as follows:  1/05/2007 0:00:00 in the table.
I want to retrieve the series of numbers for a certain date that has been entered (without taking in account the hours and seconds).
A where clause seems to be needed but I don’t know the syntax or don’t find the right function
I use the following code to insert the row :
 
command.Parameters.Add(new SqlParameter("@Date", SqlDbType.DateTime, 40, "LDate"));
command.Parameters[6].Value = DateTime.Today.ToString();
command.ExecuteNonQuery();
 
and the following code to get the row back (to put in arraylist):
 
“SELECT C1, C2, C3, C4, C5, C6 FROM Series WHERE (LDate = Today())�?
 WHERE LDate =  '" + DateTime.Today.ToString() + "'"
 
Which is the correct syntax?  Is there a better way to insert and select based on the date?
 
I don’t get any error messages and the code executes fine but I only get an empty datatable in my dataset (the table isn’t looped for rows I noticed while debugging).
Today’s date is in the database but isn’t found by my tsql code I think.
 
Any help would be greatly appreciated!
 
Grtz
 
Pascal