using System;using System.Text;using System.Windows.Media; namespace WpfApplication1.Helper{    public static class RandomHelper    {        private static Random randomSeed = new Random();         /// <summary>        /// Generates a random string with the given length        /// </summary>        /// <param name="size">Size of the string</param>        /// <param name="lowerCase">If true, generate lowercase string</param>        /// <returns>Random string</returns>        public static string RandomString(int size, bool lowerCase)        {            // StringBuilder is faster than using strings (+=)            StringBuilder RandStr = new StringBuilder(size);             // Ascii start position (65 = A / 97 = a)            int Start = (lowerCase) ? 97 : 65;             // Add random chars            for (int i = 0; i < size; i++)                RandStr.Append((char)(26 * randomSeed.NextDouble() + Start));             return RandStr.ToString();        }         public static int RandomInt(int min, int max)        {            return randomSeed.Next(min, max);        }         public static double RandomDouble()        {            return randomSeed.NextDouble();        }         public static double RandomNumber(int min, int max, int digits)        {            return Math.Round(randomSeed.Next(min, max - 1) + randomSeed.NextDouble(), digits);        }         public static bool RandomBool()        {            return (randomSeed.NextDouble() > 0.5);        }         public static DateTime RandomDate()        {            return RandomDate(new DateTime(1900, 1, 1), DateTime.Now);        }         public static DateTime RandomDate(DateTime from, DateTime to)        {            TimeSpan range = new TimeSpan(to.Ticks - from.Ticks);            return from + new TimeSpan((long)(range.Ticks * randomSeed.NextDouble()));        }         public static Color RandomColor()        {            return Color.FromRgb((byte)randomSeed.Next(255), (byte)randomSeed.Next(255), (byte)randomSeed.Next(255));        }     }}