The correct way to display a WinForms modal dialog

winforms_display_modal_good.cs

private void btnShowUserDialog_Click(object sender, EventArgs e)  
{
    using (var form = new SelectUserForm())
    {
        form.SelectedUsers = SelectedUsers;

        if (form.ShowDialog(this) == DialogResult.OK)
        {
            SelectedUsers = form.SelectedUsers;
            lblUsers.Text = SelectedUsers.Values.ToDelimitedString(", ");
            lblUsers.Tag = SelectedUsers.Keys.ToDelimitedString(",");
        }
    }
}