title: Car rental programming on c#
body: <p>I have work on car rental program but i have some problem with rental class.
  If i need to checked that this car in array have already rent yet? What should i do.
  If have declare array of car stock like this :</p>
  
  <pre><code>static void Main(string[] args)
      {
  
          Car[] car;
          car = new Car[5];
          Car[] car;
          car = new Car[5];
          car[0] = new Car("Number", "Brand", "Model", Kilometers);
          and go on till car[4]
  </code></pre>
  
  <p>What i I should do to checked the car?</p>