title: Replace backslash with double backslash
body: <p>I want to change the backslash in a string to double backslash.</p>
  
  <p>I have</p>
  
  <pre><code>String path = "C:\Program Files\Text.txt";
  </code></pre>
  
  <p>and I want to change it to</p>
  
  <pre><code>"C:\\Program Files\\Text.txt"
  </code></pre>