LIST in C#
A List can be initiated as 
List<datatype> list = new List<datatype>();


A List can be added with values as 
list.Add(value);


Example: 
using System;
using System.Collections.Generic;

namespace forgetCode
{
    class program
    {
        public static void Main()
        {
            List<int> list = new List<int>();
            list.Add(1);
            list.Add(2);
            list.Add(3);
            list.Add(4);
        }
    }
}