How to use C# List Class in System.Collections.Generic namespace ?

One of the classes introduced by the System.Collections.Generics namespace is named List. This is probably the most commonly used generic class of the .NET Framework. It is primarily the  System.Collections.Generics equivalent of the System.Collections's ArrayList. It allows you to create a list of any kind of value.

List < T > Class
The Collection classes are a group of classes designed specifically for grouping together objects and performing tasks on them. List class is a collection and defined in the System.Collections.Generic namespace and it provides the methods and properties like other Collection classes such as add, insert, remove, search etc.

The C# List < T > class represents a strongly typed list of objects that can be accessed by index and it supports storing values of a specific type without casting to or from object.

Syntex how to create List object:-
          List<OblectType> ItemList = new List<OblectType>();
Operations with parameters :-
             ItemList.Add(Object)
             ItemList.InsertAt(Index, Object)
             ItemList.Remove(Object)
             ItemList.RemoveAt(Index)
   int Count=ItemList.Count;
             ItemList.Sort()
             ItemList.ToArray()


Source code:-

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace ConsoleAppDemo

{

    class Program

    {

        static void Main(string[] args)

        {

            List_Operations classObj = new List_Operations();

            while (true)

            {

                // Console.Clear();

                Console.WriteLine("\n");

                Console.WriteLine("1. Add an Item");

                Console.WriteLine("2. Insert Item at any position");

                Console.WriteLine("3. Remove Item by using Name");

                Console.WriteLine("4. Remove Item by using Index");

                Console.WriteLine("5. Display List Items");

                Console.WriteLine("6. Sort List Items");

                Console.WriteLine("7. Copy List Items into Array");

                Console.WriteLine("8. Exit");

                Console.Write("Select your choice: ");

                int choice = Convert.ToInt32(Console.ReadLine());

                switch (choice)

                {

                    case 1:

                        classObj.Add();

                        break;

                    case 2: classObj.InsertItem();

                        break;

                    case 3: classObj.RemoveItem();

                        break;

                    case 4: classObj.RemoveItemAt();

                        break;

                  

                    case 5: classObj.Display();

                        break;

                    case 6: classObj.SortList();

                        break;

                    case 7: classObj.CopyToArray();

                        break;

                    case 8: System.Environment.Exit(1);

                        break;

                }

                Console.ReadKey();

            }

        }

    }

    public class List_Operations

    {

        string item;

        List<string> ItemList = new List<string>();

        // Add an Item ti List

        public void Add()

        {

            Console.WriteLine("\nEnter a Item to Add");

            item = Console.ReadLine();

            ItemList.Add(item);

             Console.Write("\nAdded successfully! \n");

        }

         

        //insert an item into List

        public void InsertItem()

        {

             Console.Write("\nEnter the position to insert an Item: \n");

             int index= int.Parse(Console.ReadLine());

             Console.Write("\nEnter the value to Insert: \n");

             string value= Console.ReadLine();

             ItemList.Insert(index, value);

             Console.Write("\nInserted successfully! \n");

        }

        //sort itemms in the List

        public void SortList()

        {

            ItemList.Sort();

            Console.Write("\nAfter shorting ArrryList: \n");

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

            {

               Console.Write(ItemList[i]);

               Console.Write("\n");

            }

        }

        //remove an item at any given position

        public void RemoveItemAt()

        {

            Console.Write("\nEnter the position to Remove an Item: \n");

            int index= int.Parse(Console.ReadLine());

            ItemList.RemoveAt(index);

            Console.Write("\nItem Removed successfully!: \n");

           

        }

        //remove an item

        public void RemoveItem()

        {

            Console.Write("\nEnter Item name to Remove an Item: \n");

            string item = Console.ReadLine();

            ItemList.Remove(item);

            Console.Write("\nItem Removed successfully!: \n");

        }

        //Copy  items into Array

        public void CopyToArray()

        {

            string[] arr = new string[ItemList.Count];

            arr = ItemList.ToArray();

            Console.Write("\nItem copied successfully!: \n");

        }

        // Display Items in the List

        public void Display()

        {

            Console.Write("\nItems in the List are: \n");

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

            {

               Console.Write(ItemList[i]);

               Console.Write("\n");

            }

        }

      

    }

}

Output:-

Listing:- 1

Continue Listing:- 2

Continue Listing:- 3

Continue Listing:- 4

Continue Listing:- 5