public static void ReplaceItemTest()
        {
            string[] anArray = new string[] { "one", "two", "three", "four" };
            ObservableCollection <string>      collection = new ObservableCollection <string>((IEnumerable <string>)anArray);
            CollectionAndPropertyChangedTester helper     = new CollectionAndPropertyChangedTester();

            helper.ReplaceItemTest(collection, 1, "seven");
            helper.ReplaceItemTest(collection, 3, "zero");
        }
 public static void ReplaceItemTest()
 {
     string[] anArray = new string[] { "one", "two", "three", "four" };
     ObservableCollection<string> collection = new ObservableCollection<string>((IEnumerable<string>)anArray);
     CollectionAndPropertyChangedTester helper = new CollectionAndPropertyChangedTester();
     helper.ReplaceItemTest(collection, 1, "seven");
     helper.ReplaceItemTest(collection, 3, "zero");
 }