Can I not catch a specific or custom exception?

Question

I dont want to catch some exception. Can I do it somehow?

Can I say something like this:

catch (Exception e BUT not CustomExceptionA)
{
}

?

Answer 1

try
{
      // Explosive code
}
catch (CustomExceptionA){ throw; }
catch (Exception ex)
{
    //classic error handling
}

Answer 2

try
{
}
catch (Exception ex)
{
    if (ex is CustomExceptionA)
    {
        throw;
    }
    else
    {
        // handle
    }
}