VB.NET finding distance between two addresses

I'm trying to develop VB.NET application that has two text boxes and one command button. First text box accepts first address (i.e. Ajdovšcina 4, 1513 Ljubljana) and second text box accepts second address (i.e. Trg republike 2, 1520 Ljubljana). When you put both addresses into text boxes and press command button the VB.NET application needs to do the following:
1) Calculate shortest distance (in kilometer) between two addresses provided;
2) Draw the route on the map insight the application where it is possible to do zoom in and zoom out.

To achieve item 1, I found we could use either Google maps API or Bing maps. Currently, I do not know any other solutions (perhaps you do), since I do not have longitude or latitude information for addresses.

Any of your help or suggestions will be more than welcome. Thank you very much.
JanjaNovakAsked:
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Valliappan ANSenior Tech ConsultantCommented:
There are a number of APIs other than Google APIs and Bing APIs, or MapQuest, these are which seem to be more popular though, or you may go open source.

http://www.creativebloq.com/inspiration/top-seven-alternatives-google-maps-api-7122779
(7 great alternatives to the Google Maps API)

http://stackoverflow.com/questions/448534/powerful-net-map-apis
(Powerful Net Map APIs)

Here is some sample code:
http://www.codeproject.com/Articles/684735/Allow-Users-to-Zoom-In-On-Any-A
(using goMap plugin)

http://www.dreamincode.net/forums/topic/237176-simple-map-with-zoom-pan-node/
(Some useful links for map)


Here is some libraries /open source for Google Map API:
http://www.ohloh.net/p/gmaps-api-net

http://sourceforge.net/projects/gwt/
(GWT - Google Maps API)

 Thanks.
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