private void LoadRule_Click(object sender, RoutedEventArgs e) { List <string> loadedRules = new List <string>(ruleService.LoadRules()); UIInstructions.Clear(); loadedRules.ForEach(rule => UIInstructions.Add(rule)); Excluders = loadedRules.FindAll(excludeRule => excludeRule.Contains("Excluder")); loadedRules.RemoveAll(rule => Excluders.Contains(rule)); Instructions = loadedRules; if (UIInstructions.Count > 0) { MapBtn.IsEnabled = true; } }