Windows phone 8 - NotSupportedException in DataTransferManager.ShowShareUI

Question

I am trying to implement share functionality in windows phone 8 where if a user long press on an image it shows a context menu with default share options (including installed applications through which we can share on Phone). For that I am using DataTransferManager Class and getting System.NotSupportedException - Specified method is not supported. when I am calling the below event

private void Image_Hold(object sender, GestureEventArgs e)
        {                         
            // get the DataTransferManager object associated with current window
            **var dataTransferManager = DataTransferManager.GetForCurrentView();**

            // register event to handle the share operation when it starts
            dataTransferManager.DataRequested -= OnDataRequested;
            dataTransferManager.DataRequested += OnDataRequested;

            // show the charm bar with Share option opened
            DataTransferManager.ShowShareUI();
        }

I am referring MSDN for the same which says minimum requirement is Windows Phone 8 and this API will be supportive only in native apps.

Please, let me know any way to resolve this. Thanks in advance.