Example of IList in Generic Lists C#

using System; 
using System.Collections.Generic; 
namespace w3example { 
    class w3example { 
        static void Main(string[] args) { 
            // create a new list 
            IList<string> list = new List<string>() ; 
            // add new items with the Add method 
            list.Add("item1") ; 
            // use the indexer to set the third value 
            list[ 2] = "item3changed"; 
            // insert an item at the head of the list 
            list.Insert(0, "item0"); 
 						// remove an item 
            // enumerate the items in the list 
            foreach (string str in list) { 
                Console.WriteLine("List item: {0}", str); 
            // check for items in the list 
            Console.WriteLine("Index of {0}: {1}", "item1",  
                list.IndexOf("item1") ); 
            Console.WriteLine("Index of {0}: {1}", "item2",  
                list.IndexOf("item2") ); 
            // wait for input before exiting 
            Console.WriteLine("Press enter to finish"); 

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