DirectSound Device issue in WPF application

I am working on WPF application which uses PRISM library and MVVM pattern.

I needed to use DirectSound to meet certain requirements.

I tried to initialize instance of Device class from Initialize() method  as follows:

var windowHandle = new WindowInteropHelper(Application.Current.MainWindow).Handle;
            var AppDevice=new Device(windowHandle);
            AppDevice.SetCooperativeLevel(windowHandle, CooperativeLevel.Normal);

but when it reaches to this method, application does not proceed at all and shows following statement if paused in Debug mode: 

It says, "This is the next statement to execute when this thread returns from the current function".

please help me out.

Dheeraj