title: String.Format value in App.config is producing an extra backslash
body: <p>Here's the line from App.Config:</p>
  
  <pre><code>&lt;add key="CheckFileFormatString" value="P{0}\t&amp;quot;{1}, {2}&amp;quot;\t{3}\t{4}\t{5}\t{6}\t{7}\t{8}\t{9}\t{10}"/&gt;
  </code></pre>
  
  <p>Here's the code that puts it into a string (please ignore the deprecated <code>.AppSettings.Get</code> call, unless that's the problem):</p>
  
  <pre><code>string format = ConfigurationSettings.AppSettings.Get("CheckFileFormatString");
  </code></pre>
  
  <p>...and here's the resulting string:</p>
  
  <pre><code>P{0}\\t\"{1}, {2}\"\\t{3}\\t{4}\\t{5}\\t{6}\\t{7}\\t{8}\\t{9}\\t{10}
  </code></pre>
  
  <p>Where's the extra backslash coming from?</p>