Hi Abizar,
The Developing Universal Windows apps forum is for developers to discuss writing UWP apps to run on Windows.
Looking at the Computer Vision API page at https://azure.microsoft.com/en-us/services/cognitive-services/computer-vision/ it looks like the best place to ask development questions about that API is on
Stackoverflow
or by opening a support case on your
Azure Developer Support Plan.
That said, from a quick look at the example JSON on https://azure.microsoft.com/en-us/services/cognitive-services/computer-vision/ you should be able to iterate through the JSON to collate the "text" fields in the recognitionResult.
--Rob