private void Prueba_Load(object sender, EventArgs e)
{
BindingSource bs = new BindingSource();
ClientManager clientManager = new ClientManager();
List<Client> query = clientManager.GetActiveClients().ToList();
bs.DataSource = query.ToList();
dataGridView1.DataSource = bs;
foreach (var item in query)
{
listBox1.Items.Add(item);
}
}