/// <summary>
        /// Gets the serial key numeric.
        /// </summary>
        /// <param name="keyLength">Length of the key.</param>
        /// <returns>System.String.</returns>
        public static string GetSerialKeyNumeric(SNKeyNumLength keyLength)
        {
            Random rn = new Random();
            double sd = Math.Round(rn.NextDouble() * Math.Pow(10, (int)keyLength) + 4);

            return(sd.ToString().Substring(0, (int)keyLength));
        }
        public static string MakeNumericKey(SNKeyNumLength keyLength)
        {
            Random rn = new Random();
            double sd = Math.Round(rn.NextDouble() * Math.Pow(10, (int)keyLength) + 4);

            return(sd.ToString(CultureInfo.InvariantCulture).Substring(0, (int)keyLength));
        }
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        public static string GetSerialKeyNumeric(SNKeyNumLength keyLength)
        {
            Random random = new Random();

            return(Math.Round(random.NextDouble() * Math.Pow(10.0, (double)keyLength) + 4.0).ToString().Substring(0, (int)keyLength));
        }