The index of the first element in array 0 and the index of the last element is n-1 where n is the length of the size of the array.For ArrayList, the value of the length of the array list can be changed dynamically. During the runtime, it is not possible to change the value of the length of the array. The dimension of the array and each dimension length is initialized when the array is created.Whereas the array list size is not fixed and it increases with the 2^n. The size of the array is fixed and it contains the sequential collection of all the same type elements.Main Differences Between ArrayList and Array in C# RemoveAt(): it is used to remove specific elements in the ArrayList.Remove(): it is used to remove a single element,.insert(): it is used to insert elements at the specific index in the ArrayList.Add(): it is used to add elements in the ArrayList.Some of the functions that are used to interact with data stored in the arraylist.

Some of the important functions for arraylist are RemoveAt(), Remove(), Insert(), and Add().

Also, ArrayList is non-generic, which allows us to store elements of different data types. In the array list, the size is increased with 2^n value.In case, if a coder has initiated memory for 4 elements, then one can add one more element. ArrayList does not have any fixed size, the memory size is dynamic and you can change it when you want.A collection in programming languages is a special class that stores the data and allows programmers to retrieve. It is considered to be one of the most flexible data in language C3. Array lists are initialized using the list interface.

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