WIA flatbed scan

I'm using this code to scan documents using scanner's feeder. What do I have to change, so that flatbed is used?

edit: I removed the while(hasP开发者_开发技巧ages) loop and hasPages check... But somehow I must set that flatbed is used but don't know how.

I had to add this to switch statement:

case 3088:
    SetProperty(item, 2); // 1 = feeder, 2 = flatbed
    break;