Censor words in text (Exercise)

using System;
using System.Text;

namespace ConsoleTests
{
    class ConsoleTests
    {
        static void Main()
        {
            Console.Write("Enter text: ");
            string text = Console.ReadLine();
            Console.Write("Enter censored words (separated by comma): ");
            string forbidden = Console.ReadLine();
            string[] forbiddenWords = forbidden.Split(',');
            StringBuilder result = new StringBuilder(text);
            foreach (var forbiddenWord in forbiddenWords)
            {
                result.Replace(forbiddenWord, new string('*', forbiddenWord.Length));
            }
            Console.WriteLine(result);
        }
    }
}