Data commit

Task/Symmetric-difference/C-sharp/symmetric-difference.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace RosettaCode.SymmetricDifference
+{
+    public static class IEnumerableExtension
+    {
+        public static IEnumerable<T> SymmetricDifference<T>(this IEnumerable<T> @this, IEnumerable<T> that)
+        {
+            return @this.Except(that).Concat(that.Except(@this));
+        }
+    }
+
+    class Program
+    {
+        static void Main()
+        {
+            var a = new[] { "John", "Bob", "Mary", "Serena" };
+            var b = new[] { "Jim", "Mary", "John", "Bob" };
+
+            foreach (var element in a.SymmetricDifference(b))
+            {
+                Console.WriteLine(element);
+            }
+        }
+    }
+}