In sending notifications to mobile device you need to write a code for it

First you will create the events for that

//Currently it will raise only for android devices
        static void DeviceSubscriptionChanged(object sender, 
        string oldSubscriptionId, string newSubscriptionId, INotification notification)
        {
            //Do something here
        }

        //this even raised when a notification is successfully sent
        static void NotificationSent(object sender, INotification notification)
        {
            //Do something here
        }

        //this is raised when a notification is failed due to some reason
        static void NotificationFailed(object sender, 
        INotification notification, Exception notificationFailureException)
        {
            //Do something here
        }

        //this is fired when there is exception is raised by the channel
        static void ChannelException
        	(object sender, IPushChannel channel, Exception exception)
        {
            //Do something here
        }

        //this is fired when there is exception is raised by the service
        static void ServiceException(object sender, Exception exception)
        {
            //Do something here
        }

        //this is raised when the particular device subscription is expired
        static void DeviceSubscriptionExpired(object sender, 
        string expiredDeviceSubscriptionId, 
        	DateTime timestamp, INotification notification)
        {
            //Do something here
        }

        //this is raised when the channel is destroyed
        static void ChannelDestroyed(object sender)
        {
            //Do something here
        }

        //this is raised when the channel is created
        static void ChannelCreated(object sender, IPushChannel pushChannel)
        {
            //Do something here
        }

Then the events handler for associating to the events

//create the puchbroker object
var push = new PushBroker();
//Wire up the events for all the services that the broker registers
push.OnNotificationSent += NotificationSent;
push.OnChannelException += ChannelException;
push.OnServiceException += ServiceException;
push.OnNotificationFailed += NotificationFailed;
push.OnDeviceSubscriptionExpired += DeviceSubscriptionExpired;
push.OnDeviceSubscriptionChanged += DeviceSubscriptionChanged;
push.OnChannelCreated += ChannelCreated;
push.OnChannelDestroyed += ChannelDestroyed;