try
{
    int num = 100;
    int den = 0;
    try
    {
        Console.WriteLine("Message1");
        int res = num / den;
        Console.WriteLine("Message2");
    }
    catch (ArithmeticException)
    {
        Console.WriteLine("Message3");
    }
}
catch (Exception)
{ 
}
finally
{
    Console.WriteLine("Message4");
}