windows phone 8.1 - Getting the position of the point where the user taps on a map -

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How do I get latitude and longitude of the point where the user tap on the map?

I tried to do this: 

  gOchordinate status = MyMap.ConvertViewportPointToGeoCoordinate (e.GetPosition (MyMap));

But I get an error that ConvertViewportPointToGeoCoordinate . There is no definition for


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