title: string concatenation problem
body: <p>Please how this string concatenation taking place?
  i am really confuse what is happening why that slash i there and how the double quotes are used</p>
  
  <pre><code>SessionStateItemCollection items = new SessionStateItemCollection();
  
  items["LastName"] = "Wilson";
  items["FirstName"] = "Dan";
  
  foreach (string s in items.Keys)
    Response.Write("items[\"" + s + "\"] = " + items[s].ToString() + "&lt;br /&gt;");
  
  //here i am looking for explanation please elaborate me on this please
  Response.Write("items[\"" + s + "\"] = " + items[s].ToString() + "&lt;br /&gt;");
  </code></pre>