ArrayList in C#

Introduction

Today, I bet to throw light on ArrayList in C#. ArrayList has great feature because it can increase and decrease its size dynamically. ArrayList accepts also null value, moreover it allows to add duplicate values.

Namespace:

using System.Collections;

using System;

Here is listed an example how we can add items into ArrayList.

private void ArraryListInCSharp()

        {

            ArrayList slist = new ArrayList();

            slist.Add("tc");

            slist.Add("C#");

            slist.Add("asp.net");

            slist.Add("vb.net");

            slist.Add("SQL");

           if (slist.Count == 0)

            {

                MessageBox.Show(slist.Count.ToString());

            }

           

            Int16 iCount = Convert.ToInt16(slist.Count - 1);

            for (int i = 0; i <= slist.Count - 1; i++)

            {

                label1.Text = label1.Text + slist[i].ToString() + ", ";

            }

        }

In this example below, showing how we can we remove single item from ArrayList.

        private void Remove_Item_in_CSharp()

        {

            // Declare array

            List<int> TC = new List<int>();

            // adding element in arraylist

            TC.Add(7);

            TC.Add(9);

            TC.Add(18);

            TC.Add(27);

            TC.Add(72);

            // removing item from list

            TC.RemoveAll(item => item == 9);

            /* Output would be like as below:

             7

             18

             27

             72

     */

        }

Here another example in row, how can we remove item from ArrayList in specific range, showing below example gracefully.

        private void Remove_Range_In_CSharp()

        {

            // Declare array

            List<int> TC = new List<int>();

            // adding element in arraylist

            TC.Add(7);

            TC.Add(9);

            TC.Add(18);

            TC.Add(27);

            TC.Add(72);

            // remove range to remove item in c#

            TC.RemoveRange(0, 3);

            // Output

            // 72

        }

Now finally demonstrating how to add items in LinkedList as following:

        private void Linked_List_In_CSharp()

        {

            // Declare Linkedlist

            LinkedList<string> TC = new LinkedList<string>();

            // adding element in Linkedlist

            TC.AddLast("C#");

            TC.AddLast("SilverLight");

            TC.AddLast("MVC");

            TC.AddFirst("Windows Apps");

            // accessing each item in for loop

            foreach (var _itemTC in TC)

            {

                Console.WriteLine(_itemTC);

            }

            // ***Output will be as follow***

            // Windows Apps

            // C#

            // SilverLight

            // MVC

        }

Conclusion:

In above example, I have explained in detail about Add item in ArrayList, Remove single item from ArrayList, remove items range from ArrayList then finally demonstrate about LinkedList.

OOPS, ASP.Net Interview Questions and Answers:

• What is Interface class in c# ?
• What is Abstraction class ?
• What is difference between Interface and Abstraction Class ?