title: Adding a char into string (or Chararray) c#
body: <p>Let say I have a string  "ABCDEFGH"and I would like to add a char into this string such as (adding Z to the fourth column);</p>
  
  <blockquote>
    <p>ABC<strong>Z</strong>DEFGH</p>
  </blockquote>
  
  <p>How can I do this efficiently instead of changing string into char, moving all chars to the new column, and adding the char later?</p>