Редици.04.02.Most frequent number in string

using System;
using System.Collections.Generic;
class LongestEqualSubsequence
{
    static void Main()
    {
        string someText = "AASDDSDASD";
        FinsMostFrequant(someText);
    }

    static void FinsMostFrequant(string someText)
    {
        int len = 1, bestLen = 0;
        char value = ' ';
        List<int> list = new List<int>();

        for (int i = 0; i < someText.Length; i++)
        {
            if (list.Contains(someText[i]))
            {
                continue;
            }
            char firstEl = someText[i];
            for (int g = i + 1; g < someText.Length; g++)
            {
                if (firstEl == someText[g])
                {
                    len++;
                    if (len > bestLen)
                    {
                        bestLen = len;
                        value = someText[i];
                    }
                }
            }
            len = 1;
            list.Add(someText[i]);
        }
        Console.WriteLine("Best times -> " + bestLen);
        Console.WriteLine("Value -> " + value);
    }
}