ArrayList.LastIndexOf Method (Object)
Assembly: mscorlib (in mscorlib.dll)
abstract LastIndexOf : value:Object -> int override LastIndexOf : value:Object -> int
The ArrayList is searched backward starting at the last element and ending at the first element.
This method performs a linear search; therefore, this method is an O(n) operation, where n is Count.
Starting with the .NET Framework 2.0, this method uses the collection’s objects’ Equals and CompareTo methods on item to determine whether item exists. In the earlier versions of the .NET Framework, this determination was made by using the Equals and CompareTo methods of the item parameter on the objects in the collection.