title: Convert binary to signed int/decimal
body: <p>I am trying to convert hex data to signed int/decimal and can't figure out what I'm doing wrong. </p>
  
  <p>I need <code>FE</code> to turn into <code>-2</code>. </p>
  
  <p>I'm using <code>Convert.ToInt32(fields[10], 16)</code> but am getting <code>254</code> instead of <code>-2</code>. </p>
  
  <p>Any assistance would be greatly appreciated.</p>