I tried to get the Bing AppID as instructed in chapter 13. I registered, but it wasn't displayed as was with Flickr. What should I do?

Did you Register with the Microsoft Azure Marketplace and create a subscription for the Bing Search API?
https://datamarket.azure.com/registe...Fbing%2Fsearch

Do you see the different subscriptions with the free 5000 transactions/month?

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I too had the same issue. Problem is, we are looking for a property called AppId but I don't think there's one. When you get to the marketplace, subscribe to the Bing Search API (5000 subscriptions/month, unless you want more). After that, click the Data menu item at the top of the page. And next to the Bing Search API, click on "use" (you should see "subscribed" in green above this). At the top, you should see a "Show" link next to "Primary Account Key". Click it. The text that appears is your "AppId". Copy and paste it into the appropriate spot in visual studio

Getting the AppId for Flickr is even easier. Register for a yahoo account if you don't have one. Then click on the link in the book. Select "Apply for a Non-commercial key" fill in your details and hit submit. On the next page, you should see your "Key" in bold at the top of the screen. That is your appId.