title: Use String.Split to split by character in c#
body: <p>I have a string named String1. How can I use String.Split to split it by letters into letters[].</p>
  
  <p>As an example, say <code>String1 = "Hello World"</code>. How can I split it so that <code>letters[0] = H</code>, <code>letters[1] = e</code>, <code>letters[2] = l</code>, and so on.</p>