.NET Framework 4.6 and 4.5
Replaces the route at the specified index.
protected override void SetItem(
When you add an unnamed route to the RouteCollection object, you cannot add a route that already is in the collection.
Use the GetReadLock method and the GetWriteLock method to make sure that you interact with the collection without conflicts from other processes.
Supported in: 4.6, 4.5, 4, 3.5 SP1
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