private async void BtnSearch_Click(object sender, EventArgs e)
        {
            AppointmentSearchRequest request = new AppointmentSearchRequest
            {
                DentistName    = txtDentistName.Text,
                DentistSurname = txtDentistSurname.Text,
                ClientName     = txtClientName.Text,
                ClientSurname  = txtClientSurname.Text,
                TreatmentName  = txtTreatmentName.Text
            };

            if (checkBoxDate.Checked)
            {
                request.StartDate = null;
                request.EndDate   = null;
            }
            else
            {
                request.StartDate = dtpReservationFrom.Value.Date;
                request.EndDate   = dtpReservationTo.Value.Date;
                if (request.EndDate.Value.Date < request.StartDate.Value.Date)
                {
                    MessageBox.Show("Field reservation to must be greater than field reservation from!");
                    return;
                }
            }

            var list = await _appointmentService.GetAll <List <Appointment> >(request);

            List <frmAppointmentsDataVM> AppointmentList = new List <frmAppointmentsDataVM>();

            foreach (var item in list)
            {
                frmAppointmentsDataVM appointment = new frmAppointmentsDataVM
                {
                    AppointmentID  = item.AppointmentID,
                    DentistName    = item.Dentist.FirstName,
                    DentistSurname = item.Dentist.LastName,
                    ClientName     = item.User.FirstName,
                    ClientSurname  = item.User.LastName,
                    TreatmentName  = item.Treatment.Name,
                    Date           = item.StartDate.ToString("MM/dd/yyyy HH:mm")
                };
                AppointmentList.Add(appointment);
            }
            dgvAppointments.AutoGenerateColumns = false;
            dgvAppointments.DataSource          = AppointmentList;
            if (AppointmentList.Count == 0)
            {
                MessageBox.Show("There are no results for this search", "Warning", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
        }
        private async void FrmAppointmentsData_Load(object sender, EventArgs e)
        {
            var list = await _appointmentService.GetAll <List <Appointment> >(null);

            List <frmAppointmentsDataVM> AppointmentList = new List <frmAppointmentsDataVM>();

            foreach (var item in list)
            {
                frmAppointmentsDataVM appointment = new frmAppointmentsDataVM
                {
                    AppointmentID  = item.AppointmentID,
                    DentistName    = item.Dentist.FirstName,
                    DentistSurname = item.Dentist.LastName,
                    ClientName     = item.User.FirstName,
                    ClientSurname  = item.User.LastName,
                    TreatmentName  = item.Treatment.Name,
                    Date           = item.StartDate.ToString("MM/dd/yyyy HH:mm")
                };
                AppointmentList.Add(appointment);
            }
            dgvAppointments.AutoGenerateColumns = false;
            dgvAppointments.DataSource          = AppointmentList;
        }