How to get ChannelUri and send a broadcast push notification to windows phone app using ASP.NET

See more:

ASP.NET

C#5.0

I am just learning about how to send and receive push notifications as a windows phone mobile developer. I got a nice jumpstart from this article https://msdn.microsoft.com/en-us/library/windows/apps/hh202967(v=vs.105).aspx[^]. But in the article, I had to copy out the channel Uri from the output window while running the client app, then pasted it in the ASP.NET sample site, before I could send a toast notification to the client. But I know I can't do that, after publishing my app to the store. So how do I get channelUri from client apps in my ASP.NET site, have it stored in a database or collection whose size could increase and then send a broadcast notification message to every device whose channelUri is in the database. I would also like to know how to write the code for sending message to specific users. I would love it if there is a sample code.