Hacker Rank Palindrome Index Problem Solution C#

PalindromeIndex.cs

using System.CodeDom.Compiler;
using System.Collections.Generic;
using System.Collections;
using System.ComponentModel;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.Serialization;
using System.Text.RegularExpressions;
using System.Text;
using System;

class Solution {

    // Complete the palindromeIndex function below.
    static int palindromeIndex(string s) 
    {
        int maxIndex = s.Length/2;

        for (int i = 0; i < maxIndex; i++)
        {
            if(s[i] != s[s.Length -1 - i])
            {
                  if(s.Substring(i + 1, 2) == Reverse(s.Substring((s.Length - 1 - i)-1, 2)) )
                    {
                        return i;
                    }
                    else
                    {
                        return (s.Length - 1 - i);
                    }

               return i;
            }
        }

        return -1;
    }

    static string Reverse(string str)
    {
        string reverse = "";  
        int Length = 0;  
        Length = str.Length - 1;  
        while(Length>=0)  
        {  
            reverse = reverse + str[Length];  
            Length--;  
        } 
        return reverse;
    }

    static void Main(string[] args) {
        TextWriter textWriter = new StreamWriter(@System.Environment.GetEnvironmentVariable("OUTPUT_PATH"), true);

        int q = Convert.ToInt32(Console.ReadLine());

        for (int qItr = 0; qItr < q; qItr++) {
            string s = Console.ReadLine();

            int result = palindromeIndex(s);

            textWriter.WriteLine(result);
        }

        textWriter.Flush();
        textWriter.Close();
    }
}