using System;

public class Program

{

      public static void Main()

      {

         CatchException();

      }

​

      static void CatchException()

      {

         try

         {

            CatchAndRethrowExplicitly();

         }

         catch(ArithmeticException e)

         {

            Console.WriteLine("Explicitly specified:{0}{1}", Environment.NewLine, e.StackTrace);

         }

​

         try

         {

            CatchAndRethrowImplicitly();

         }

         catch(ArithmeticException e)

         {

            Console.WriteLine("{0}Implicitly specified:{0}{1}", Environment.NewLine, e.StackTrace);

         }

      }

​

      static void CatchAndRethrowExplicitly()

      {

         try

         {

            ThrowException();

         }

         catch(ArithmeticException e)

         {

            // Violates the rule. 

            throw e;

         }

      }

​

      static void CatchAndRethrowImplicitly()

      {

         try

         {

            ThrowException();

         }

         catch(ArithmeticException e)

         {

            // Satisfies the rule. 

            throw;

         }

      }

​

      static void ThrowException()

      {

         throw new ArithmeticException("illegal expression");

      }

}