title: How to calculate the distance between two locations with ASP.NET?
body: <p>I'm wondering about the feasability of this below. Of course, I'm not asking for the complete code (although it would be nice!) but rather a way to achieve the following in ASP.NET:</p>
  
  <p>I have a site. People register on it and provide their Country of residence as well as the ZIP code and City name which is then stored in a SQL Server DB. I have a search engine on my site and I would like one of the filtering options to be "only show me members living at a maximum distance of 100 kilometers".</p>
  
  <p>Any ideas, hints, already written code I can re-use, free API's doing just that, etc... ?</p>
  
  <p>Thank you for your time!</p>