/// <summary>
        /// Метод для записи клента на курс
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Record_Click(object sender, RoutedEventArgs e)
        {
            int      IndexClient  = ComboBoxNameClient.SelectedIndex + 1;
            int      IndexService = ServiceObject.ID;
            Regex    Time1        = new Regex("[0-1][0-9]:[0-5][0-9]");
            Regex    Time2        = new Regex("2[0-3]:[0-5][0-9]");
            TimeSpan TS;
            DateTime DT;

            if (ComboBoxNameClient.SelectedItem != null)
            {
                if ((Time1.IsMatch(TextBoxInputTime.Text) || Time2.IsMatch(TextBoxInputTime.Text)) && TextBoxInputTime.Text.Length == 5)
                {
                    TS = TimeSpan.Parse(TextBoxInputTime.Text);
                    DT = Convert.ToDateTime(DateLection.SelectedDate);
                    DT = DT.Add(TS);//Дата и время
                    if (DT > DateTime.Now)
                    {
                        Record.IsEnabled = true;
                        ClientService NewClientService = new ClientService()
                        {
                            ClientID = IndexClient, ServiceID = IndexService, StartTime = DT
                        };
                        Classes.DataClass.RE.ClientService.Add(NewClientService);
                        Classes.DataClass.RE.SaveChanges();
                        MessageBox.Show("Клиент записан");

                        int      min = ServiceObject.DurationInSeconds / 60;
                        DateTime DT1 = DT.AddMinutes(min);
                        TimeSpan TS1 = DT1.TimeOfDay;
                        TextBoxOutTime.Text = Convert.ToString(TS1);
                    }
                    else
                    {
                        MessageBox.Show("Занятие уже прошло");
                    }
                }
                else
                {
                    MessageBox.Show("Неверно указано время");
                }
            }
            else
            {
                MessageBox.Show("Не все поля заполнены");
            }
        }