public void EventAddUpdate()
{ //****************************************
var MySeed = Environment.TickCount;
var MyRandom = new Random(MySeed);
var MyRecords = new ObservableSortedList <int, int>(1);
NotifyCollectionChangedEventArgs MyEventArgs = null, MyKeyEventArgs = null, MyValueEventArgs = null;
//****************************************
MyRecords.CollectionChanged += (sender, e) => MyEventArgs = e;
MyRecords.Keys.CollectionChanged += (sender, e) => MyKeyEventArgs = e;
MyRecords.Values.CollectionChanged += (sender, e) => MyValueEventArgs = e;
var Pair = new KeyValuePair <int, int>(MyRandom.Next(), MyRandom.Next());
MyRecords.BeginUpdate();
MyRecords.Add(Pair);
//****************************************
Assert.IsNull(MyEventArgs, "Event Raised");
Assert.IsNull(MyKeyEventArgs, "Event Raised");
Assert.IsNull(MyValueEventArgs, "Event Raised");
//****************************************
MyRecords.EndUpdate();
Assert.AreEqual(1, MyRecords.Count, "Item count does not match");
Assert.IsNotNull(MyEventArgs, "No Event Raised");
Assert.AreEqual(NotifyCollectionChangedAction.Reset, MyEventArgs.Action);
Assert.IsNotNull(MyKeyEventArgs, "No Key Event Raised");
Assert.AreEqual(NotifyCollectionChangedAction.Reset, MyKeyEventArgs.Action);
Assert.IsNotNull(MyValueEventArgs, "No Value Event Raised");
Assert.AreEqual(NotifyCollectionChangedAction.Reset, MyEventArgs.Action);
}