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UIBackgroundTaskInvalid is defined in UIApplication.h as:
typedef NSUInteger UIBackgroundTaskIdentifier;
UIKIT_EXTERN const UIBackgroundTaskIdentifier UIBackgroundTaskInvalid __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_4_0);
MonoTouches UIApplication.BeginBackgroundTask returns an int.
MonoTouch has a static define for UIApplication.BackgroundTaskInvalid, which I assume is supposed to correlate to UIBackgroundTaskInvalid, but it is an NSString instead of an NSUInteger or int.
Implementing a trivial backgrounding sample like this:
Fixed (for 5.1.2 and 5.0.5).