...
private void timer1_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            try
            {
                    Options paramOpt = new Options();
                    //OptionsSerializer.CreateSettings(paramOpt);
                    OptionsSerializer.LoadSettings(ref paramOpt);
                    
               
                if ((DateTime.Today.DayOfWeek.ToString() != "Saturday") ||(DateTime.Today.DayOfWeek.ToString() != "Sunday")
                    && (DateTime.Now.Hour==paramOpt.HourTime)) 
                    
                {
                    //<summary>
                    // Создание соединения БД
                    //</summary>
                    //string connectionString =
                    //    "Data Source=UMN-ASUP-RVV;Initial Catalog=Corporation;Integrated Security=True";

                    //corporationConnectionString
                    string corporationcConnectionString =
                          "Data Source=YANUS-A;Initial Catalog=corporation;Integrated Security=True";

                    SqlConnection conn = new SqlConnection(corporationcConnectionString);
                    try
                    {
                        conn.Open();
                    }
                    catch (SqlException ex)
                    {
                        this.file.WriteLine(DateTime.Now.ToString("dd.MM.yyyy HH:mm:ss\t") + ex);
                        this.file.Flush();
                        return;
                    }


                    //<summary>
                    // Создание и заполнение DataSet и DataTable из таблицы Personal
                    //</summary>
                    string SelectString = "Select id, fio, birthdate, email FROM personal";
                    SqlCommand SelectPersonal = conn.CreateCommand();
                    SelectPersonal.CommandText = SelectString;
                    SqlDataAdapter PersonalSqlDataAdapter = new SqlDataAdapter();
                    PersonalSqlDataAdapter.SelectCommand = SelectPersonal;
                    DataSet CorporationDataSet = new DataSet();
                    string dataTableName = "Personal";
                    PersonalSqlDataAdapter.Fill(CorporationDataSet, dataTableName);


                    //<summary>
                    // Создание и заполнение DataSet и DataTable из таблицы Sending
                    //</summary>
                    string SendingString = "Select * FROM Sending";
                    SqlCommand SelectSending = conn.CreateCommand();
                    SelectSending.CommandText = SendingString;
                    SqlDataAdapter SendingSqlDataAdapter = new SqlDataAdapter();
                    SendingSqlDataAdapter.SelectCommand = SelectSending;
                    string TableName = "Sending";
                    SendingSqlDataAdapter.Fill(CorporationDataSet, TableName);


                    conn.Close();


                    DataRow[] rowPersonal = CorporationDataSet.Tables[dataTableName].Select();
                    DataRow[] rowSending = CorporationDataSet.Tables[TableName].Select();

                    int n = 0;
                    StringBuilder myTelo = new StringBuilder();
                    foreach (DataRow rowtelo in rowPersonal)
                    {
                        if (rowtelo["birthdate"] != DBNull.Value)
                        {
                            if (HasBirthdayAnniversary(Convert.ToDateTime(rowtelo["birthdate"]), paramOpt.Opt))
                            {
                                object myTeloObj = rowtelo["birthdate"];
                                if (myTeloObj != DBNull.Value)
                                {
                                    myTelo.Append(
                                   String.Format("{0}\t{1}\r\n",
                                                 Convert.ToDateTime(rowtelo["birthdate"]).ToShortDateString(),
                                                 rowtelo["fio"].ToString().Trim()));


                                    n = n + 1;
                                }
                            }
                        }
                    }
                    
                    if (n == 0)
                    {
                        myTelo.Append("Именинников нет!!!");
                    }


                    foreach (DataRow rp in rowPersonal)
                    {
                        foreach (DataRow rs in rowSending)
                        {
                            if (Equals(rp["id"], rs["Personal_id"]))
                            {
                                MailMessage mail = new MailMessage();
                                MailAddress mAddress = new MailAddress("service@ppdmn.com");
                                mail.From = mAddress;
                                mail.To.Add(rp["email"].ToString());
                                mail.Subject = "Поздравляем с днем рождения!!!";
                                mail.BodyEncoding = System.Text.Encoding.UTF8;
                                mail.Body = myTelo + "\n";
                                SmtpClient client = new SmtpClient("main");
                                client.Send(mail);
                                file.WriteLine(DateTime.Now.ToString("dd.MM.yyyy HH:mm:ss\t") + "Send to: " +
                                               rp["email"].ToString());
                                file.Flush();

                            }
                        }
                    }
                }
            }
            catch
               (Exception exc)
            {
                this.file.WriteLine(DateTime.Now.ToString("dd.MM.yyyy HH:mm:ss\t") + exc);
                this.file.Flush();
                return;
            }
        }
}
...