Simplify StockMarket (C#) folder structure

83_Stock_Market/csharp/Extensions/RandomExtensions.cs

@@ -0,0 +1,46 @@
+using System;
+using System.Collections.Generic;
+
+namespace Game.Extensions
+{
+    /// <summary>
+    /// Provides additional methods for the <see cref="Random"/> class.
+    /// </summary>
+    public static class RandomExtensions
+    {
+        /// <summary>
+        /// Generates an infinite sequence of random numbers.
+        /// </summary>
+        /// <param name="random">
+        /// The random number generator.
+        /// </param>
+        /// <param name="min">
+        /// The inclusive lower bound of the range to generate.
+        /// </param>
+        /// <param name="max">
+        /// The exclusive upper bound of the range to generate.
+        /// </param>
+        /// <returns>
+        /// An infinite sequence of random integers in the range [min, max).
+        /// </returns>
+        /// <remarks>
+        /// <para>
+        /// We use an exclusive upper bound, even though it's a little
+        /// confusing, for the sake of consistency with Random.Next.
+        /// </para>
+        /// <para>
+        /// Since the sequence is infinite, a typical usage would be to cap
+        /// the results with a function like Enumerable.Take.  For example,
+        /// to sum the results of rolling three six sided dice, we could do:
+        /// </para>
+        /// <code>
+        /// random.Integers(1, 7).Take(3).Sum()
+        /// </code>
+        /// </remarks>
+        public static IEnumerable<int> Integers(this Random random, int min, int max)
+        {
+            while (true)
+                yield return random.Next(min, max);
+        }
+    }
+}