In Compact framework 1.0, we don't have any managed class which handles bluetooth socket connections.

InTheHand is a third party component which gives the functionalities of bluetooth services for windows mobile. You can download the InTheHand from here

here URL : Download 32feet.NET 2.0.60828 for Windows Mobile PocketPC - Softpedia

Using the code
In this article the source code available for download. There have been the devices are displaying in a combobox when click the first button name of Search devices. Then we can connect the selected device from the combobox by clicking the button named Connect.

The code is noted in below which is used in the project.

//// Directives.
using InTheHand.Net;
using InTheHand.Net.Bluetooth;
using InTheHand.Net.Sockets;
////Declaration//
private BluetoothClient bluetoothClient;
private Guid service = BluetoothService.DialupNetworking;
////Search the devices and displaying in combobox.//
BluetoothRadio.PrimaryRadio.Mode = RadioMode.Discoverable;
bluetoothClient = new BluetoothClient();
Cursor.Current = Cursors.WaitCursor;
BluetoothDeviceInfo[] bluetoothDeviceInfo = { };
bluetoothDeviceInfo = bluetoothClient.DiscoverDevices(10);
comboBox1.DataSource = bluetoothDeviceInfo;
comboBox1.DisplayMember = "DeviceName";
comboBox1.ValueMember = "DeviceAddress";
comboBox1.Focus();
Cursor.Current = Cursors.Default;
////Connect the selected device.//
bluetoothClient.Connect(new BluetoothEndPoint((BluetoothAddress)
_comboBox1.SelectedValue, service));


you can download the sample code from here: URL : The Code Project - Member Logon - Free Source Code and Tutorials