Have to add 1 row other draws without error.

i need fast answer please any one help me

DateTime dgvdatetime = DateReceived;
dgvdatetime.AddHours(TimeReceived.Hour);
dgvdatetime.AddMinutes(TimeReceived.Minute);
dgvdatetime.AddSeconds(TimeReceived.Second);
dgvdatetime = ; //dgvdatetime + " " + TimeReceived(ToString);