private void btnEditClient_Click(object sender, EventArgs e)
{
var selectedClient = lbClients.SelectedItem as Client;
addClient = new EditClient(selectedClient, this);
addClient.ShowDialog(this);
addClient.Dispose();
}
private void btnAddClient_Click(object sender, EventArgs e)
{
addClient = new EditClient(this);
addClient.ShowDialog(this);
addClient.Dispose();
}