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;
        }

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Get Javascript Random Value

javascript

C#