public event PushpinDragHandler PushpinDrag;

public void OnPushpinDrag(string pID)
    {
        // Check if there are any Subscribers
        if (PushpinDrag != null)
        {
            // Call the Event
            GoogleMapObject = (GoogleObject)System.Web.HttpContext.Current.Session["GOOGLE_MAP_OBJECT"];
            PushpinDrag(pID);
        }
    }