In pc , I can find all bluetooth devices ,but through c# code lijke BluetoothClient.DiscoverDevices() , return nothing ,I don't know why ? who can help me out? my pc has installed Jabra A320s Bluetooth device

my bluetooth equipment is Jabra A320s , not Belkin F8T012 , How can I get my Jabra A320s working on XP SP2 using the MS Stack

my device type is Network adapters,and device provider is %V_WIDCOMM% , now BluetoothDeviceInfo[ array = bc.DiscoverDevices() can't find any device , what's wrong ? could you help me out ?