I've deleted your duplicate thread. Please don't start new threads if you don't get answered. Just add a post to your existing thread to bring it back to people's attention.
You say ListBox here but you said ComboBox in the other thread. Either way, your best bet is to use a DataReader to read the values you want from the database and either add them directly to ListControl or add them to an array and then assign that to the control's DataSource. Assuming you are using a database that supports ADO.NET, I suggest you read about the OleDbDataReader class.