/// <summary>
/// Select the device by the device name.
/// </summary>
public void SelectDeviceByName(Vintasoft.Twain.DeviceManager deviceManager, string deviceName)
{
    // open TWAIN device manager
    deviceManager.Open();

    // select the device by device name
    Vintasoft.Twain.Device device = deviceManager.Devices.Find(deviceName);
    // if device is not found
    if (device == null)
        // throw exception
        throw new System.Exception("Device is not found.");

    // acquire images asynchronously
    device.Acquire();
}

''' <summary>
''' Select the device by the device name.
''' </summary>
Public Sub SelectDeviceByName(ByVal deviceManager As Vintasoft.Twain.DeviceManager, ByVal deviceName As String)
    ' open TWAIN device manager
    deviceManager.Open()

    ' select the device by device name
    Dim device As Vintasoft.Twain.Device = deviceManager.Devices.Find(deviceName)
    ' if device is not found
    If device Is Nothing Then
        ' throw exception
        Throw New Exception("Device is not found.")
    End If

    ' acquire images asynchronously
    device.Acquire()
End Sub