document.write('
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  1. public class ExpressionDemo
  2. {
  3. public void DoSomething(object param)
  4. {
  5. Validate.IsNotNull(param, "param");
  6. }
  7. }
  8.  
  9. public static class Validate
  10. {
  11. public static void IsNotNull(object o, string parameterName)
  12. {
  13. if (o != null)
  14. return;
  15.  
  16. throw new ArgumentNullException(parameterName);
  17. }
  18. }
');