using System;

​

int x = 5;

int y = 0;

​

try

{

    try

    {

        int z = x / y;

    }

    catch (Exception ex)

    {

        throw new ArithmeticException("Arithmetic exception", ex);

    }

}

catch (Exception ex)

{

    Console.WriteLine(ex.Message);

    Console.WriteLine(ex.InnerException.Message);

}