Find maximum occurring character in a string

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

class MainClass {
    public static void Main(string[] args)
    {
        string str = "sample string";
        Console.WriteLine("Max occurring character is: "
                          + getMaxOccurringChar(str));
    }

    // function that return maximum occurring character
    static char getMaxOccurringChar(string str)
    {
        // create dictionary to store frequency of every
        // character
        Dictionary<char, int> mp
            = new Dictionary<char, int>();

        // to store length of string
        int n = str.Length;

        // to store answer
        char ans = '\0';

        // to check count of answer character is less or
        // greater than another elements count
        int cnt = 0;

        // traverse the string
        for (int i = 0; i < n; i++) {
            // push element into map and increase its
            // frequency
            if (mp.ContainsKey(str[i])) {
                mp[str[i]]++;
            }
            else {
                mp.Add(str[i], 1);
            }

            // update answer and count
            if (cnt < mp[str[i]]) {
                ans = str[i];
                cnt = mp[str[i]];
            }
        }

        return ans;
    }
}

using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static Dictionary<char, int> FindMaxCharacterCount(string str)
    {
        Dictionary<char, int> countMap = new Dictionary<char, int>();

        // Count occurrences of each character
        foreach (char ch in str)
        {
            if (countMap.ContainsKey(ch))
            {
                countMap[ch]++;
            }
            else
            {
                countMap[ch] = 1;
            }
        }

        // Find the character with the maximum count
        char maxChar = '\0';
        int maxCount = 0;

        foreach (var entry in countMap)
        {
            if (entry.Value > maxCount)
            {
                maxChar = entry.Key;
                maxCount = entry.Value;
            }
        }

        Dictionary<char, int> result = new Dictionary<char, int>();
        result[maxChar] = maxCount;
        return result;
    }

    static void Main(string[] args)
    {
        string str = "geeksforgeeks";

        // Call the function and print the result
        Dictionary<char, int> result = FindMaxCharacterCount(str);
        Console.WriteLine($"Character: {result.First().Key}, Count: {result.First().Value}");
    }
}