telegram-bot/Core/Extensions/StringExtension.cs

using System.Web;

namespace Kruzya.TelegramBot.Core.Extensions
{
    public static class StringExtension
    {
        public static string HtmlEncode(this string content)
        {
            return HttpUtility.HtmlEncode(content);
        }

        public static string HtmlDecode(this string content)
        {
            return HttpUtility.HtmlDecode(content);
        }
    }
}