Business coordinates in radius of mobile device

How could I find the businesses within a certain radius of a mobile GPS device (mobile phone)?

I am looking to build a location aware app that shows the businesses as I drive down the freeway... so let's say within a 5 mile radius.

I know this already exists, I just like to know how that can be programmed (any platform but preferably C# or Java).
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james-ct16Connect With a Mentor Commented:

I believe you need to make a few fundamental platform decisions. Windows phone 7 has some great Location services and they give you access to bing maps at no charge and that will take you down a Silverlight / c# route. It will not be backwardly compatible to previous versions of Windows Mobile. Theres the basic Bing Maps Integration guide here 

If you wanted to look at the Windows mobile 6 there is a nice guide here however remember unlike mobile 7 there is no guarantee the mobile has any form of location services other that knowing what cell tower its connected to (assuming it has radio)

hjgodeConnect With a Mentor Commented:
Yes, there are already such apps.

You first need the GPS location of the device and then a webservice that queries an online service for the data you need. If there is not already a web service offering a Nearby-Business information, you have to setup your own webservice.

An example of a free webservice for this is at

They offer different types of what to search nearby your location and hopefully they have more data for the USA as for germany.
conrad2010Author Commented:
just to be clear, I indeed want this for Windows Phone 7 and I agree it's not backwards compatible with Windows Mobile
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