void CheckIfUserIsLoggedIn(object param) { MessageBox.Show("Username to check: " + CheckUserName); var machines = Networks.Where(x => x.StartsWith("cubicle", StringComparison.OrdinalIgnoreCase)); MessageBox.Show("Cmputers to check: " + string.Join(",", machines)); var machineName = _library.CheckIfUserIsLoggedIntoMachine(machines, CheckUserName); if (!string.IsNullOrEmpty(machineName)) { MessageBox.Show($"Found {machineName}"); } }