//Delete EventHandler that deletes only if there is any item in ObservableCollection.
public void Delete_Click(object sender, EventArgs e)
{
int index = listContacts.SelectedIndex;
if (index != -1)
{
c1.DeleteContact(index);
}
else
{
MessageBox.Show("List is Empty. Please add before deleting", "Unable to Delete", MessageBoxButton.OK, MessageBoxImage.Error);
}
}
