private void BESave_Click(object sender, RoutedEventArgs e)
 {
     try
     {
         BEClass bEClass = BEBdGrid.SelectedItem as BEClass;
         bdClassUpdate.UpdateBE(bEClass.Id, UserIdName.SelectedItem.ToString(), BEIdName.SelectedItem.ToString(), (DateTime)BEDate.SelectedDate);
     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.Message);
     }
     finally
     {
         refreshBEBdGrid();
     }
 }
        private void BEDelete_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                if (BEBdGrid.SelectedItem != null)
                {
                    BEClass bEClass = BEBdGrid.SelectedItem as BEClass;

                    bdClassDelete.DeleteRowTable(bEClass.Id, "BE");
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                refreshBEBdGrid();
            }
        }
        private void BEBdGrid_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            try
            {
                if (BEBdGrid.SelectedItem != null)
                {
                    BEClass bEClass = BEBdGrid.SelectedItem as BEClass;

                    int indexExhibition = BEIdName.Items.IndexOf(bEClass.Exhibition);
                    BEIdName.SelectedItem = BEIdName.Items.GetItemAt(indexExhibition);

                    int indexUser = UserIdName.Items.IndexOf(bEClass.UserMail);
                    UserIdName.SelectedItem = UserIdName.Items.GetItemAt(indexUser);

                    BEDate.SelectedDate = bEClass.Date;
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }