list foreach

tryjsil.cs

using System;
using JSIL;
using JSIL.Meta;
using System.Collections.Generic;

public static class Program {
  public static void Main () {
    var list = new List<long?>() { 1, 0, 3, null };
    for (int i = 0; i < list.Count; i++)
	{
    	if (list[i].HasValue && list[i].Value == 0)
    	{
	        list[i] = null;
	    }
	}
    
    foreach(var item in list)
    {
      Console.WriteLine(item);
    }
    
  }  
  
}