Print longest palindrome word in a sentence

/* C# program to print longest palindrome
word in a sentence and its length*/
using System;
class GFG 
{
    // Function to check if a
    // word is palindrome
    static bool checkPalin(string word)
    {
        int n = word.Length;
    
        // making the check case
        // case insensitive
        word = word.ToLower();
    
        // loop to check palindrome
        for (int i = 0; i < n; i++, n--)
            if (word[i] != word[n - 1])
                return false;
    
        return true;
    }
    
    // Function to find longest
    // palindrome word
    static string longestPalin(string str)
    {
        
        // to check last word for palindrome
        str = str + " ";
    
        // to store each word
        string longestword = "", word = "";
    
        int length, length1 = 0;
        for (int i = 0; i < str.Length; i++)
        {
            char ch = str[i];
    
            // extracting each word
            if (ch != ' ')
                word = word + ch;
            else {
                length = word.Length;
                if (checkPalin(word) && 
                        length > length1)
                {
                    length1 = length;
                    longestword = word;
                }
    
                word = "";
            }
        }
    
        return longestword;
    }
    
    // Driver code
    public static void Main()
    {
        string s = "My name is ava and i"
           + " love Geeksforgeeks";
    
        if (longestPalin(s) == "")
            Console.Write("No Palindrome Word");
        else
            Console.Write(longestPalin(s));
    }
} 

// This code is contributed by Manish 
// Shaw (manishshaw1)

// C# program for the above approach
using System;
using System.Collections.Generic;
using System.Linq;

public class Program {
  // Function to check if a string is a palindrome
  public static bool IsPalindrome(string s) {
    return s.Equals(new string(s.Reverse().ToArray()));
  }
  // Function to find the largest palindrome in a list of
  // words
  public static void LargestPalin(List < string > s) {
    // Create a new list to store all the palindromes
    // found
    List < string > newList = new List < string > ();

    // Iterate over each word in the input list
    foreach(string word in s) {
      // Check if the current word is a palindrome
      if (IsPalindrome(word)) {
        // If it is, add it to the new list
        newList.Add(word);
      }
    }

    // Sort the new list in ascending order of length
    newList.Sort((a, b) => a.Length - b.Length);

    // Print the largest palindrome (last element in the
    // sorted list)
    Console.WriteLine(newList[newList.Count - 1]);
  }

  public static void Main(string[] args) {
    // Input string to be processed
    string str = "My name is ava and i love Geeksforgeeks";
    // Create a list to store all the words in the input
    // string
    List < string > words = new List < string > ();
    // Create a string builder to build each word from
    // the input string
    System.Text.StringBuilder word = new System.Text.StringBuilder();

    // Iterate over each character in the input string
    foreach(char c in str) {
      // If the current character is a space, the
      // current word is complete
      if (c == ' ') {
        // Add the current word to the list of words
        words.Add(word.ToString());
        // Reset the string builder to build the
        // next word
        word.Clear();
      } else {
        // Otherwise, append the current character
        // to the current word
        word.Append(c);
      }
    }

    // If there is a word left in the string builder,
    // add it to the list of words
    if (word.Length > 0) {
      words.Add(word.ToString());
    }

    // Find the largest palindrome in the list of words
    LargestPalin(words);
  }
}
// Contributed by adityasharmadev01

using System;
using System.Linq;

class Program {
    static bool IsPalindrome(string word)
    {
        return word.SequenceEqual(word.Reverse());
    }

    static string LargestPalin(string s)
    {
        // Convert string to array of words
        var words = s.Split(
            new char[] { ' ' },
            StringSplitOptions.RemoveEmptyEntries);
        // Using LINQ to filter palindrome words
        var palindromeWords = words.Where(IsPalindrome);
        // Using LINQ to find the word with the maximum
        // length
        var largestPalindrome
            = palindromeWords
                  .OrderByDescending(word = > word.Length)
                  .FirstOrDefault();
        return largestPalindrome;
    }

    static void Main(string[] args)
    {
        string s
            = "My name is ava and i love Geeksforgeeks";
        string largestPalindrome = LargestPalin(s);
        Console.WriteLine(largestPalindrome);
    }
}