title: how to apply two's complement to string hex in c#
body: <p>I need help conversion my hex string to hex with two's complement in c#</p>
  
  <p><strong>Exemple: 0x00FEB5AB → 0x00014A55</strong></p>
  
  <p>My hex. 00FF17DB → ? (this represents negative latitude value)</p>
  
  <p>And 00FCFF75 → ? (this represents negative longitude value)</p>
  
  <p>Thank you =)</p>