Translation Methods - Part 1

namespace MethodsOfTranslations
{
    using System;
    public class Program
    {
        // Sample Input and Output
        //
        // |----------|----------------------------------------------------|
        // | Input    | Output                                             |
        // |----------|----------------------------------------------------|
        // |          |Type a word to check whether it is in the language: |
        // |(null)    | Word is in the language.                           |
        // | 0        | Word is in the language.                           |
        // | 0011     | Word is in the language.                           |
        // | 1100     | Word is not in the language.                       |
        // | asdasd   | Word is not in the language.                       |
        // | End      | The program has ended.                             |
        // |----------|----------------------------------------------------|

        public static void Main(string[] args)
        {
            Console.WriteLine("Type a word to check whether it is in the language:");
            string word = Console.ReadLine();
            while (word != "End") // Program stops upon "End" input
            {
                // Conditional statement checks whether word is part of the language
                if (IsWordInFormalLanguage(word))
                    Console.WriteLine("Word is in the language.");
                else
                    Console.WriteLine("Word is not in the language.");

                word = Console.ReadLine(); // The user needs to enter a new word, therefore repeating the loop.
            }
            Console.WriteLine("The program has ended.");
        }

        public static bool IsWordInFormalLanguage(string word)
        {

            // Checks if the word is null, "1", or "0".
            if(string.IsNullOrEmpty(word) || word == "1" || word == "0")
            {
                // If it's true there is no need to proceed.
                return true;
            }

            // Iterates input word
            for (int i = 0; i < word.Length; i++)
            {
                // Checks if the input contains only "1s", and "0s".
                if (word[i] != '1' && word[i] != '0')
                {
                    // The word is a part of the language.
                    return false;
                }

                // Checks whether there is another letter after the current word[i]
                if (i != word.Length-1)
                {
                    // Checks whether the letter is "1"
                    if (word[i] == '1')
                    {
                        // Checks whether the next letter is "0".
                        if (word[i + 1] == '0')
                        {
                            // If the next letter is "0", the program will return false because
                            // from the problem description, we know that this is not in the language scope.
                            // The word is not a part of the language.
                            return false;
                        }
                    }
                }
            }
            // The word is a part of the language.
            return true;
        }
    }
}