Rate my palindrome checker algorithm

Hi guys, it's been a long time since I visited this site in 2023. So, currently, I am a full-stack developer with 2 years of experience. Two days ago, I had a user interview with a 15 minutes live coding test for .NET Developer role. The test was to find if a word is a palindrome or not. So this is my code:

using System;
class HelloWorld {
  static void Main() {
        var word="input";

        char[] lowerCaseWordArr= word.ToLower().ToCharArray();

        var newString=new string (lowerCaseWordArr);
        var reversedString="";
        for(int i=newString.Length-1;i>=0;i--){
            reversedString+=newString[i];
        };

        if(word.ToLower()==reversedString){
            Console.Write("This is palindrome");
        }else{
            Console.Write("This is not palindrome");
        }
    }
  }

How do you rate my code, and what should I improve?