public static string generateClientContext()
    {
        return (((long)Math.Round(microtime(true) * 1000) << 22 | NextLong(long.MinValue, long.MaxValue) & 4194303) & long.MaxValue).ToString();
    }

    public static long NextLong(long min, long max)
    {
        System.Random rd = new System.Random();
        if (max <= min)
            throw new ArgumentOutOfRangeException("max", "max must be > min!");
        ulong uRange = (ulong)(max - min);
        ulong ulongRand;
        do
        {
            byte[] buf = new byte[8];
            rd.NextBytes(buf);
            ulongRand = (ulong)BitConverter.ToInt64(buf, 0);
        }
        while (ulongRand > ulong.MaxValue - ((ulong.MaxValue % uRange) + 1) % uRange);
        return (long)(ulongRand % uRange) + min;
    }
    internal static double microtime(bool need_double_with_dot)
    {
        string val = Settings.GetLongUnixtime(DateTime.Now);
        if (need_double_with_dot)
            val = val.Insert(val.Length - 3, ",");
        double res = 0; //format 1565115353.205
        try
        {
            res = double.Parse(val); //format 1565115353.205
        }
        catch
        {
            val = val.Replace(",", ".");
            res = double.Parse(val); //format 1565115353,205
        }
        //time()//1602698651.770
        return res;
    }




string client_context = Settings.generateClientContext();