Convert Date time format

Question

Hi
I have a Db2 data base in db2 the date and time stored including millisec.I want to get the data from DotNet C#. For comparing I have a data without milli sec.so i want to remove the millisec dta in db and compare .
This is my C# Query.
"SELECT " + "'(TIMESTAMP_FORMAT(StartDate,'YYYY-MM-DD HH24:MI:SS'))'"+ " FROM TableName where " + FirstName+ " = '" + fName + "'";
Can any one guide to get the result without Millisec.
Thanks