title: String that contains multiple values
body: <p>I'm making a small login form.
  The user can login with username: Test, test1, test2, test3</p>
  
  <p>Is it possible to make a string like:</p>
  
  <pre><code>string username("test",  "test1", "test2", "test3");
  </code></pre>
  
  <p>And use a code like this:</p>
  
  <pre><code>if (usernameTextBox.Text == username)
  {
      //Something
  }
  </code></pre>
  
  <p>So when the user write in any of the choises i made in the string, he can login.</p>