Answer / Shailendra Kumar

To play a video file stored in IsolatedStorage, first, you need to read the video file into a `Stream`. Then, create an instance of `MediaElement`, set its source to the stream, and call the `Play()` method. Here's an example:

```csharp
Stream videoStream = await IsolatedStorageFile.GetUserStoreForApplication().OpenToRead("video.mp4", FileMode.Open);
MediaElement mediaElement = new MediaElement();
mediaElement.SetSource(videoStream, "video/mp4");
mediaElement.Play();
```

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