In windows phone 7 how to do the location aware programming

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C#

Hye everyone,

I have been trying the GPS or location tracking and showing the place on Bing Map in Windows Phone 7.

Now, if I have latitude and longitude, I can get the place.
and i can show it on bing map too.

Now i want something like,
Restaurant/hospital tracker.

I mean, if i m in a city, and i want to know all the nearest restaurants or hospitals, I'll just type "Hospital" and press "Go"
and it will show me all the hospitals marked by pushpins on Bing map.

Now i can show multiple locations on map, if i have latitudes and longitudes. (I tried some hard code, and i worked)

But i don't know how to get latitude and longitude according to a particular location (some web service ?).

Thanks in advance.