Removes the first occurrence of a specific object from the ArrayList.
Type Reason NotSupportedException The current instance is read-only or has a fixed size.
This method performs a linear search; therefore, this method is an O(n) operation, where n is ArrayList.Count.
This method determines equality by calling object.Equals(object).
In collections of contiguous elements, such as lists, the elements that follow the removed element move up to occupy the vacated spot. If the collection is indexed, the indexes of the elements that are moved are also updated. This behavior does not apply to collections where elements are conceptually grouped into buckets, such as a hash table.