Hi, I had try with the Microsoft mobile library in a Pocket PC with Windows CE 5.0 and I get the same error that you get with the InTheHand Library, here is my code:

using Microsoft.Windo wsMobile.Shared Source.Bluetoot h;
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private BluetoothRadio PrimaryBTRadio = new BluetoothRadio( );

private void button1_Click(o bject sender, EventArgs e)
{

...