Displaying progress bar while loading JSON from Web Services for Windows Phone 7

In one of my previous posts I explained how to download and parse JSON response from web services. I used a simple text to show that the content is loading, but it isn’t convenient because you don’t know how long it remains to wait. In this post I will add the ProgressBar control to the project which will constantly display the number of downloaded bytes in per cents.
Here is how it looks:
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