createList.cs

using System;
using System.Collections.Generic;

public class Program
{
	public static void Main()
	{
		// adding elements using add() method
		var Idnumbers = new List<int>();
		Idnumbers.Add(1);
		Idnumbers.Add(3);
		Idnumbers.Add(5);
		Idnumbers.Add(7);
		
		Console.WriteLine("No of elelemts numbers: "+ Idnumbers.Count);

		var Mycities = new List<string>();
		Mycities.Add("New York");
		Mycities.Add("Sri Lanka");
		Mycities.Add("Mumbai");
		Mycities.Add("Chicago");
		Mycities.Add(null); // null is allowed
		Console.WriteLine("No of elelemts MySities: " + Mycities.Count);
		
		// adding elements using collection initializer syntax
		var bigCities = new List<string>() {"New York", "London", "Mumbai", "Chicago"};
		
		Console.WriteLine("No of elelemts bigCities: " + bigCities.Count);	
		
		var students = new List<StudentDetails>() { 
                new StudentDetails(){ Id = 1, Name="Bill"},
                new StudentDetails(){ Id = 2, Name="Steve"},
                new StudentDetails(){ Id = 3, Name="Ram"},
                new StudentDetails(){ Id = 4, Name="Abdul"}
            };
		Console.WriteLine("No of elelemts Students: " + students.Count);
	}
}

class StudentDetails{
	public int Id { get; set; }
	public string Name { get; set; }
}
/*
No of elelemts numbers: 4
No of elelemts MySities: 5
No of elelemts bigCities: 4
No of elelemts Students: 4
/*