//Видаляємо обрану групу
private void DeleteButton_Click(object sender, RoutedEventArgs e)
{
if (GroupsComboBox.SelectedItem != null)
{
int groupId = groups.FirstOrDefault(g => g.GroupName == GroupsComboBox.Text).GroupId;
string answer = client.DeleteGroup(groupId);
if (answer != "successfully")
{
MessageBox.Show("Something wrong!");
}
else
{
AddItemsToComboBox();
}
}
else
{
MessageBox.Show("Please select group!");
}
}
