private void button3_Click(object sender, EventArgs e) { string city = (string)citiesList.SelectedItem; string station = (string)stationsList.SelectedItem; Stopwatch stopwatch = Stopwatch.StartNew(); int availableBikes = client.GetAvailableBikesForStation(station, city); stopwatch.Stop(); label5.Text = "Execution time of GetAvailableBikes: " + stopwatch.ElapsedMilliseconds + "ms"; label5.Visible = true; label1.Text = "Available bikes: " + availableBikes; label1.Visible = true; }