title: Exposing .net methods as Excel functions?
body: <p>I have a set of calculation methods sitting in a .Net DLL.  I would like to make those methods available to Excel (2003+) users so they can use them in their spreadsheets.</p>
  
  <p>For example, my .net method:</p>
  
  <pre><code>public double CalculateSomethingReallyComplex(double a, double b) {...}
  </code></pre>
  
  <p>I would like enable them to call this method just by typing a formula in a random cell:</p>
  
  <pre><code>=CalculateSomethingReallyComplex(A1, B1)
  </code></pre>
  
  <p>What would be the best way to accomplish this?</p>