Inserting into an Oracle date column

public static void addBikeEvent(int bikeId, DateTime date, int type, string text, int userId)
        //add event to bike event log
    {
 
 
        //Get next event id:
        int nextId;
        try
        {
            nextId = Convert.ToInt32(getSingleVal("select max(id)+1 from bike_event", getConnectionStringBioBank()));
        }
        catch
        {
            nextId = 1; //in case of first time
        }
 
 
 
        //string dateString = String.Format("{0:yyyy-mm-dd HH:mm:ss}", DateTime.Now);
        //const string sqlTemplate = "insert into bike_event (id, bike_id, event_date, event_type, text, user_id) values ({0},{1},TO_DATE('{2}','yyyy-mm-dd HH24:MI:SS'),{3},'{4}',{5})";
        //string sql = String.Format(sqlTemplate, nextId, bikeId, dateString , type, text.Replace(" ",""), userId);
 
        
 
        const string sql = "insert into bike_event (id, bike_id, event_date, event_type, text, user_id) values (?,?,?,?,?,?)";
 
        OleDbConnection con = new OleDbConnection(getMyConnectionString());
        OleDbCommand cmd = new OleDbCommand(sql, con);
 
 
        cmd.Parameters.Add(new OleDbParameter("",nextId));
        cmd.Parameters.Add(new OleDbParameter("", bikeId));
        cmd.Parameters.Add(new OleDbParameter("", date));
        cmd.Parameters.Add(new OleDbParameter("", type));
        cmd.Parameters.Add(new OleDbParameter("", text.Replace(" ",""))); //& has some meaning in orcale...
        cmd.Parameters.Add(new OleDbParameter("", userId));
 
 
        try
        {
            con.Open();
            cmd.ExecuteNonQuery();
        }
        finally
        {
            con.Close();
        }
 
 
 
 
    }