try
{
    SomeAction();
}
catch(Exception _Ex)
{
    if(_Ex is NullReferenceException)
    {
        DoSomething();
    }
    else if(_Ex is ArgumentOutOfRangeException)
    {
        DoSomethingElse();
    }
}

try
{
    SomeAction();
}
catch(NullReferenceException _Ex)
{
    DoSomething();
}
catch(ArgumentOutOfRangeException _Ex)
{
    DoSomethingElse();
}

catch(Exception _Ex)
{
    if(_Ex is NullReferenceException)
    {
        DoSomething();
    }
    else if(_Ex is ArgumentOutOfRangeException)
    {
        DoSomethingElse();
    }
    throw;
}