How to do google map integration in asp.net and get the distance[not staright line] between two points

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ASP.NET

Javascript

SQL-Server

--Scenario

--the grid is as below

column1 and column2 is name of the location[both the columns x and y coordinate is there with me fetched from database]
column3 is link button.

<--GRIDVIEW-->

column1   column2  column3

loc1       loc2     linkbutton1

loc5       loc6     linkbutton2



When i click the Gridview linkbutton[column] then google map should open. And in getdirection1(A) and getdirection2(B) both x,y coordinates will be there and travel distance displaying between both points.

Kindly give me an idea over this. I tried searching google but i am not getting the exact link for it.