How can I abort installshield setup by c#?

Question

I use Install Shield 2013 limited edition. I do some configurations via an c# application (customconfigs.exe). The c# application will be invoked in my custom actions:

There are some conditions defined in my c# application. When not match, I want to trigger aborting the setup and rollback. How can I tell InstallShield to abort the setup?

static void Main(string[] args)
{
    if(false)
    {
        //please abort setup
    }
}