How Do I Get The Via Route For The Two Different Location In The Google Map

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C#

ASP.NET

Javascript

Google-Maps

Hi.... i need to find the via route for the two different location on the Google map
ex: if I've two text boxes with auto filling functionality then based on the entries it should give the via route for that locations and that should be in the drop down then based on the selection i need to plot the path on the Google map.

thanks