Replaces the route at the specified index.
protected override void SetItem(
The zero-based index of the route to replace.
The route to add at the specified index.
item is null.
item is already in the collection.
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.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.