I have an if statement where I want to abort the next steps and start over. But how can I use a Exit; (like PHP) or something like that?
This is my code:

```
if (SelectedQuantity != null | SelectedProduct != null)
{
    string toast = string.Format("You may only fill 1 of the input fields!");
    Toast.MakeText(this, toast, ToastLength.Long).Show();
}

```

After the "if", it puts values in the database, but I want to abort that process if you get in the if statement. Does anyone know how to do that?