Merge pull request #14 from MakeContributions/feature/palindrome-csharp

feat(strings): add is palindrome example for C#

strings/README.md

@@ -4,6 +4,11 @@
 
 1. [Palindrome Check](c-or-cpp/palindrome.c)
 
+### C#
+You could use any online IDE (for an example [.net Finddle](https://dotnetfiddle.net/)) to test them.
+
+1. [Palindrome Check](csharp/palindrome.cs)
+
 ### JavaScript
 
 1. [Palindrome Check](js/palindrome.js)

strings/csharp/palindrome.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Linq;
+using System.Text.RegularExpressions;
+                    
+public class Program
+{
+    public static void Main()
+    {
+        bool result = false;
+        result = IsPalindrome("abba");
+        Console.WriteLine(result);
+        result = IsPalindrome("abbccbbA");
+        Console.WriteLine(result);
+        result = IsPalindrome("Mr. Owl ate my metal worm");
+        Console.WriteLine(result);
+    }
+    
+    private static bool IsPalindrome(string source) {
+        source = source.ToLower();
+        source = Regex.Replace(source, @"[^0-9A-Za-z]", "");
+        string reverse = new string(Enumerable.Range(1, source.Length).Select(i => source[source.Length - i]).ToArray());
+        return reverse == source;
+    }
+}