added comments

RandomHelper.cs

@@ -3,15 +3,22 @@ using System.Security.Cryptography;
 
 namespace SmallInjectorDemo
 {
+    /// <summary>
+    /// Static helper class for generating random numbers.
+    /// </summary>
     public static class RandomHelper
     {
-
+        /// <summary>
+        /// Return cryptographic stable random integer.
+        /// </summary>
+        /// <param name="min">Lower border of result.</param>
+        /// <param name="max">Upper border of result.</param>
+        /// <returns>Random integer.</returns>
         public static int NewRandomInteger(int min, int max)
         {
             // The random number provider.
             using (var rand = new RNGCryptoServiceProvider())
             {
-
                 uint scale = uint.MaxValue;
                 while (scale == uint.MaxValue)
                 {