C# Online Compiler | .NET Fiddle

using System;
using System.Collections.Generic;
namespace ListCSharpExample
{

    public class ListCSharpExample
    {

        public static void Main()
        {

            // List initialization and adding elements to the end of the list:    
            List<char> lst = new List<char> { 'a', 'b', 'c' };

            //add new elements in lst
            lst.Add('d');
            lst.Add('e');
            ShowList("Initial list, followed by lst.Add('d'); lst.Add('e');", lst);

            // Insert and push towards the end
            lst.Insert(0, 'n');
            ShowList("lst.Insert(0,'n');", lst);

            // Insert at end - with Insert
            lst.Insert(lst.Count, 'x');      // equivalent to lst.Add('x');
            ShowList("lst.Insert(lst.Count,'x');", lst);

            // Insert a new list into existing list, at position 2.
            lst.InsertRange(2, new List<char> { '1', '2', '3', '4' });
            ShowList("lst.InsertRange(2, new List<char>{'1', '2', '3', '4'});", lst);

            // Remove element 0 and push toward the beginning
            lst.RemoveAt(0);
            ShowList("lst.RemoveAt(0);", lst);

            // Remove first occurrence of 'c'
            lst.Remove('c');
            ShowList("lst.Remove('c');", lst);

            // Remove 2 elements, starting at element 1
            lst.RemoveRange(1, 2);
            ShowList("lst.RemoveRange(1, 2);", lst);

           
        }

        public static void ShowList<T>(string explanation, List<T> list)
        {
            Console.WriteLine(explanation);
            foreach (T el in list)
            {
                Console.Write("{0, 3}", el);
            }
            Console.WriteLine(); Console.WriteLine();
        }

    }
}

 
using System;
using System.Collections.Generic;
namespace ListCSharpExample
{
​
    public class ListCSharpExample
    {
​
        public static void Main()
        {
​
            // List initialization and adding elements to the end of the list:    
            List<char> lst = new List<char> { 'a', 'b', 'c' };
​
            //add new elements in lst
            lst.Add('d');
            lst.Add('e');
            ShowList("Initial list, followed by lst.Add('d'); lst.Add('e');", lst);
​
            // Insert and push towards the end
            lst.Insert(0, 'n');
            ShowList("lst.Insert(0,'n');", lst);
​
            // Insert at end - with Insert

Compilation error (line 11, col 16): Expected class, delegate, enum, interface, or struct
Compilation error (line 14, col 1): Type or namespace definition, or end-of-file expected