public static void TheMostRepeatedWord(string text)
       {
           var dictionary = new Dictionary<string, int>();
           //dividimos el texto en palabras y lo almacenamos en un arreglo
           var words = text.Split(new char[] { ',', ' ', '.' },
               StringSplitOptions.RemoveEmptyEntries)
               .Select(w => w.ToLower());

           foreach (var word in words)
           {
               if (!dictionary.ContainsKey(word))
                   dictionary[word] = 1;
               else
                   dictionary[word]++;
           }
           var mostRepeatedWord = dictionary
               .OrderByDescending(x => x.Value)
               .FirstOrDefault().Key;

           Console.WriteLine(mostRepeatedWord);
       }