title: stop and begin at the beginning after wrong input
body: <p>I'm learning C# atm and I don't know how to do the following :</p>
  
  <pre><code>while (points &gt; 0)
  {
      String input = Convert.ToString(Console.ReadLine());
      if (input != true)
      {
          Console.WriteLine("wrong number!");
          // here it should stop the following code and start again at the beginning at the while-loop.
      }
      // code if number is correct
  </code></pre>
  
  <p>like a "stop;", thanks for help!</p>