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As a result ArrayList is slower than LinkedList and the latter is preferred in case you need to perform insert and delete operations in the middle of a collection.LinkedList worked 200 times faster than ArrayList when 0.1 million elements were inserted at the start of the collection.
The Item returns an Object, so you may need to cast the returned value to the original type in order to manipulate it. It is important to note that ArrayList is not a strongly-typed collection. For a strongly-typed alternative, see List<T>. ArrayList accepts null as a valid value and allows duplicate elements. This property provides the ability to access a specific element in the collection by using the following syntax: myCollection[index]. The C# language uses the keyword to define the indexers instead of implementing the Item property.