title: How to add string to the front of Text file
body: <p>This is the text file read by the <code>StreamReader</code>.</p>
  
  <pre><code>500, 120, 60, 0, 350
  100, 230, 0, 50, 0
  0, 75, 0, 0, 220
  3000, 400, 600, 35, 0
  350, 200, 100, 80, 250
  0, 285, 325, 150, 75
  </code></pre>
  
  <p>I want to add cities in front of each line, such that it reads like this:</p>
  
  <pre><code>Atlanta:  500, 120, 60, 0, 350
  Baltimore: 100, 230, 0, 50, 0
  Chicago:0, 75, 0, 0, 220
  Denver: 3000, 400, 600, 35, 0
  ELY: 350, 200, 100, 80, 250
  Fargo: 0, 285, 325, 150, 75
  </code></pre>
  
  <p>Here's the current code block.</p>
  
  <pre><code>StreamReader sr = new StreamReader("inventory.txt");
  String line = sr.ReadToEnd();
  Console.WriteLine(line);
  </code></pre>