CSharpTradeOffers.IdConversions.UlongToAccountId C# (CSharp) Метод

        public static uint UlongToAccountId(ulong steamId)
        {
            return Convert.ToUInt32(steamId - 76561197960265728);
        }

 public SteamId(ulong steamIdUlong)
 {
     if (steamIdUlong < 76561197960265728)
     {
         throw new ArgumentException("SteamIdUlong cannot be less than '76561197960265728'");
     }
     AccountId    = IdConversions.UlongToAccountId(steamIdUlong);
     SteamIdUlong = steamIdUlong;
     SteamIdText  = IdConversions.UlongToSteamIdText(steamIdUlong);
 }