//Происходит при загрузке формы, настройка элементов управления
private void AddServiceToRequest_Load(object sender, EventArgs e)
{
try
{
DBConnection.GetServices();
DBConnection.GetServicesGroups();
servicesGroup.DataSource = DBConnection.dtServicesGroups;
servicesGroup.DisplayMember = "Наименование";
servicesGroup.ValueMember = "ID";
DBConnection.GetServicesInGroup(servicesGroup.SelectedValue.ToString());
service.DataSource = DBConnection.dtServicesInGroup;
service.DisplayMember = "Название";
service.ValueMember = "id";
dateStart.Value = Convert.ToDateTime("2018-12-19");
dateEnd.Value = Convert.ToDateTime("2019-01-19");
calculate_cost_and_display();
}
catch (Exception ex) { MessageBox.Show(ex.ToString()); }
}