using System;

using HtmlAgilityPack;

public class Program

{

    public static void Main()

    {

        string html = @"<div class=""sub-title"">

                            <span class=""ng-binding"">יתרת עו""ש</span>

                        </div>";

​

        var doc = new HtmlDocument();

        doc.LoadHtml(html);

​

        var Header = doc.DocumentNode.SelectNodes("//span[@class='ng-binding']");

​

        Console.WriteLine(Header?[0].InnerText);

    }

}