Initial data commit

Task/Proper-divisors/C-sharp/proper-divisors.cs

@@ -0,0 +1,32 @@
+namespace RosettaCode.ProperDivisors
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+
+    internal static class Program
+    {
+        private static IEnumerable<int> ProperDivisors(int number)
+        {
+            return
+                Enumerable.Range(1, number / 2)
+                    .Where(divisor => number % divisor == 0);
+        }
+
+        private static void Main()
+        {
+            foreach (var number in Enumerable.Range(1, 10))
+            {
+                Console.WriteLine("{0}: {{{1}}}", number,
+                    string.Join(", ", ProperDivisors(number)));
+            }
+
+            var record = Enumerable.Range(1, 20000).Select(number => new
+            {
+                Number = number,
+                Count = ProperDivisors(number).Count()
+            }).OrderByDescending(currentRecord => currentRecord.Count).First();
+            Console.WriteLine("{0}: {1}", record.Number, record.Count);
+        }
+    }
+}