System.Data.DataTableReader.GetDateTime C# (CSharp) Метод

        public override DateTime GetDateTime(int ordinal)
        {
            ValidateState(nameof(GetDateTime));
            ValidateReader();
            try
            {
                return (DateTime)_currentDataRow[ordinal];
            }
            catch (IndexOutOfRangeException e)
            {
                // thrown by DataColumnCollection
                ExceptionBuilder.TraceExceptionWithoutRethrow(e);
                throw ExceptionBuilder.ArgumentOutOfRange(nameof(ordinal));
            }
        }

        //list the log-in sessions according to the selected criterion
        private void BuildListBox(int userID, int groupID, DateTime time1, DateTime time2, bool cvs)
        {
            string pad = "  ";
            try
            {
                DataSet sessionData = InternalAdminDB.SelectSessionHistory(userID, groupID, time1, time2);
                DataTable sessionHistory = sessionData.Tables[0];

                if (sessionHistory.Rows.Count == 0)
                {
                    lblResponse.Text = Utilities.FormatWarningMessage(" No sessions found for your criteria.");
                    lblResponse.Visible = true;
                }
                else
                {
                    StringBuilder buf = new StringBuilder();
                    buf.AppendLine(String.Format("{0,-14}{1,-18}{2,-10}{3,-10}{4,-26}{5,-24}",
                        "User Name", "Create Time", "End Time","Modify","Group","Client"));

                    DataTableReader dtr = new DataTableReader(sessionHistory);
                    while(dtr.Read())
                    {
                        //buf.Append(dtr.GetInt64(0) + pad);
                        buf.Append(String.Format("{0,-12:12}", dtr.GetString(1)) + pad);
                        if(!dtr.IsDBNull(2))
                            buf.Append(DateUtil.ToUserTime(dtr.GetDateTime(2),
                                CultureInfo.InvariantCulture,userTZ,"g") +pad);
                        else
                            buf.Append(String.Format("{0,-9:9}", "Not Set") + pad);
                        if (!dtr.IsDBNull(3))
                            buf.Append(DateUtil.ToUserTime(dtr.GetDateTime(3), CultureInfo.InvariantCulture, userTZ, "T") + pad);
                        else
                            buf.Append(String.Format("{0,-8}", "Not Set") + pad);
                        if (!dtr.IsDBNull(4))
                            buf.Append(DateUtil.ToUserTime(dtr.GetDateTime(4), CultureInfo.InvariantCulture, userTZ, "T") + pad);
                        else
                            buf.Append(String.Format("{0,-8}", "Not Set") + pad);
                        string tmp = dtr.GetString(5);
                        if (tmp != null && tmp.Length > 24)
                            tmp = tmp.Substring(0, 24);
                        buf.Append(String.Format("{0,-24}",tmp) + pad);
                        tmp = dtr.GetString(6);
                        if (tmp != null && tmp.Length > 24)
                            tmp = tmp.Substring(0, 24);
                        buf.Append(String.Format("{0,-24}",tmp));

                        buf.AppendLine();
                    }
                    txtLoginDisplay.Text = buf.ToString();
                }
            }
            catch (Exception ex)
            {
                lblResponse.Text = Utilities.FormatErrorMessage(" Cannot retrieve UserSessions. " + ex.GetBaseException());
                lblResponse.Visible = true;
            }
        }