Wp7:Push notification channel URI is null - windows-phone-7

Question

We are trying to test push notifications, using the latest code from the documentation How to: Set Up a Notification Channel for Windows Phone
public HttpNotificationChannel myChannel;
public void CreatingANotificationChannel()
{
myChannel = HttpNotificationChannel.Find("MyChannel");
if (myChannel == null)
{
myChannel = new HttpNotificationChannel("MyChannel","www.contoso.com");
// An application is expected to send its notification channel URI to its corresponding web service each time it launches.
// The notification channel URI is not guaranteed to be the same as the last time the application ran.
myChannel.ChannelUriUpdated += new EventHandler<NotificationChannelUriEventArgs>(myChannel_ChannelUriUpdated);
myChannel.Open();
}
else // Found an existing notification channel.
{
// The URI that the application sends to its web service.
Debug.WriteLine("Notification channel URI:" + myChannel.ChannelUri.ToString());
}
myChannel.HttpNotificationReceived += new EventHandler<HttpNotificationEventArgs>(myChannel_HttpNotificationReceived);
myChannel.ShellToastNotificationReceived += new EventHandler<NotificationEventArgs>(myChannel_ShellToastNotificationReceived);
myChannel.ErrorOccurred += new EventHandler<NotificationChannelErrorEventArgs>(myChannel_ErrorOccurred);
}
If HttpNotificationChannel.Find() returns null, it opens a new channel, but the ChannelUriUpdated event is never triggered.
If HttpNotificationChannel.Find() returns a channel, the ChannelUri property is null. The sample code crashes here because it assumes the ChannelUri property to be not null.
In neither case is the ErrorOccurred event triggered.
How can i solve this problem? This problem is because of microsoft server or any thing else?
Thnks in advance
EDIT
Waiting for replay,after ten days i am suffering of null uri problem
Can any one tell me how can i solve this problem some time MSPN server give chanalk uri ans some time not i mean some time it give null reference Exception.
What Microsoft doing?

Answer 1

If I don't go wrong, www.contoso.com it's a example URI to demonstrate that you need to put your own server URL address, but in my experience, I never use in that way. I prefer just to put
myChannel = new HttpNotificationChannel("MyChannel");
Look this example (it's in Spanish) but the codes are very clear of what you need to do to set the push notification client and service.
I hope I helped you.

Answer 2

You are testing in what mobile are Emulator,
Do you have developer account subscription for windows phone development,
Had you Developer unlocked your mobile,
Noorul.

Answer 3

I think the problem is that you are using the HttpNotificationChannel constructor of the authenticated web service, according to the documentation.
Instead, you should use the constructor that takes only one parameter, as you can check in this example
/// Holds the push channel that is created or found.
HttpNotificationChannel pushChannel;
// The name of our push channel.
string channelName = "ToastSampleChannel";
// Try to find the push channel.
pushChannel = HttpNotificationChannel.Find(channelName);
// If the channel was not found, then create a new connection to the push service.
if (pushChannel == null)
{
pushChannel = new HttpNotificationChannel(channelName);
...
}
Hope it helps