C# to capture date

I am using C# to run SQL and want to only pull in data from that day.  Below is my code that I am using, but it isn't returning anyr esults, but I know it should.  Makes me think that I have my day function set-up incorrectly.

string SQLQuery = "SELECT empName, empNumber, itemSold FROM store106data Where DateofSale = @DOS;"
SqlConnection connection = newSqlConnection("Connection String is here");
SqlCommand cmd = new SqlCommand(SQLQuery, conn);
//This is just a snippet not full on code, but will show the issue I am experiencing
DayOfWeek day = DateTime.Today.DayofWeek;
if (day == DayOfWeek.Tuesday)
{
DateTime now = DateTime.Now;
string dt = now.GetDateTimeFormats('d')[0];
cmd.Parameters.AddWitValue("@DOS", dt.ToString());
}

edit ---

This is returning 6/25/2013 but my database houses 06/25/2013 is that the issue? and if so, how would I set my code to return the leading 0?