OracleConnection connec = new OracleConnection("user id=*****;password=*****;data source=*****;enlist=false");
try
            {
                for (int i = 0; i < ListBox1.Items.Count; i++)
                {
                    string command = "INSERT INTO TABLE1 VALUES((SELECT O.ID FROM OBJECTS O WHERE O.OBJECT_NAME='" + Label1.Text + "'),(SELECT C.ID FROM OBJECTS C WHERE C.OBJECT_NAME='" + ListBox1.Items[i].ToString() + "'))";

                     OracleCommand cmd = new OracleCommand(command, connec);

                    LbMessage.Text = "Сделано";
                    LbMessage.Visible = true;
                }
            }
            catch (Exception ex)
            {
                LbMessage.Text = "Ошибка: " + ex.Message;
                LbMessage.Visible = true;
            }