title: how can i convert hexadecimal value to biginteger?
body: <p>I mean how can I convert my hexadecimal values to biginteger ?</p>
  
  <p>for example i use this :</p>
  
  <pre><code>string value="A1";
  BigInteger bi=new BigInteger(value,16);
  </code></pre>
  
  <p>bi =161; this is true? So how can I convert back it to "A1"? </p>
  
  <p>thanks..</p>