IsPalindrome C# String extension method example

main.cs

using System;
using Extensions;

public class MainClass
{
  public static void Main (string[] args)
  {
    var a = "test";
    var isPalindrome = a.IsPalindrome();
    Console.WriteLine ($"'{ a }' { isPalindrome ? "is palindrome" : "is NOT palindrome" }.");
  }
}

StringExtensions.cs

using System.Linq;

namespace Extensions
{
  public static class StringExtensions
  {
    public static bool IsPalindrome(this string s)
    {
      var x = s.ToCharArray()
              .AsEnumerable();
      var y = x.Reverse();

      return x.Zip(y, (m,n) => m == n)
              .All(m => m);
    }

    public static bool IsPalindromeCaseInsensitive(this string s)
    {
      s = s.ToLowerInvariant();
      return s.IsPalindrome();
    }
  }
}