public static string GetJavascriptRandomValue()
    {
        Random ranDouble = new Random();
        string strd1 = ranDouble.NextDouble().ToString();
        int strd1len = strd1.Length;
        Random ranLong = new Random();
        string strd2 = ranLong.Next().ToString() + ranLong.Next().ToString();
        int intDefLength = 18;
        string strCutFromstrd2 = string.Empty;
        if (strd1len < intDefLength)
        {
            strCutFromstrd2 = strd2.Substring(0, intDefLength - strd1len);
        }
        string strRes = strd1 + strCutFromstrd2;
       return strRes;
}