title: How to insert a value in a string at certain positions c#
body: <p>I have a program that gets a string from a method. 
  I want to know how to insert a string value to that string at certain positions.</p>
  
  <p>For example:</p>
  
  <pre><code>mystring = "column1 in('a','b')column2 in('c','d')column3 in('e','f')";
  </code></pre>
  
  <p>Here, how would I insert the string value " and "  after every occurance of the character ')' in <code>mystring</code>?</p>
  
  <p>PS. If possible, also include how not to insert it right at the end.</p>