ArrayList Class (System.Collections) | Microsoft Docs
https://docs.microsoft.com/en-us/dotnet/api/system.collections.arraylist
The ArrayList is not guaranteed to be sorted. You must sort the ArrayList by calling its Sort method prior to performing operations (such as BinarySearch) that require the ArrayList to be sorted. To maintain a collection that is automatically sorted as new elements are added, you can use the SortedSet class.. The capacity of an ArrayList is the number of elements the ArrayList can hold.
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