private void MainForm_Load(object sender, EventArgs e)
{
District d = new District();
districtbox.Items.Clear();
districtbox.DataSource = d.getDistrictList();
districtbox.SelectedIndex=-1;
userbox.Select();
}
public MainForm()
{
InitializeComponent();
District d = new District();
districtbox.DataSource = d.getDistrictList();
}