September Morn Update

Task/Reverse-a-string/C-sharp/reverse-a-string-1.cs

@@ -0,0 +1,6 @@
+static string ReverseString(string input)
+{
+    char[] inputChars = input.ToCharArray();
+    Array.Reverse(inputChars);
+    return new string(inputChars);
+}

Task/Reverse-a-string/C-sharp/reverse-a-string-2.cs

@@ -0,0 +1,7 @@
+using System.Linq;
+
+// ...
+
+return new string(input.Reverse().ToArray());
+
+// ...

Task/Reverse-a-string/C-sharp/reverse-a-string-3.cs

@@ -0,0 +1,14 @@
+public string ReverseElements(string s)
+{
+    // In .NET, a text element is series of code units that is displayed as one character, and so reversing the text
+    // elements of the string correctly handles combining character sequences and surrogate pairs.
+    var elements = System.Globalization.StringInfo.GetTextElementEnumerator(s);
+    return string.Concat(AsEnumerable(elements).OfType<string>().Reverse());
+}
+
+// Wraps an IEnumerator, allowing it to be used as an IEnumerable.
+public IEnumerable AsEnumerable(IEnumerator enumerator)
+{
+    while (enumerator.MoveNext())
+        yield return enumerator.Current;
+}