title: converting int to/from System.Numerics.BigInteger in C#
body: <p>I have a property that returns <code>System.Numerics.BigInteger</code>. When I casting the property to int, I got this error. </p>
  
  <p><code>Cannot convert type 'System.Numerics.BigInteger' to 'int'</code></p>
  
  <p>How can I convert int to/from <code>System.Numerics.BigInteger</code> in C#?</p>