How to calculate distance from target coordinates to different coordinates

[Learning Rocks]

Hello Everyone,
I started learning asp.net/c# recently. i need some help to achieve my assignment. I want to show distance of each coordinates from target location in a table like below.

Id Target Coordinates(Lat & Long) Various Coordinates Distance
1001 43.662352, -79.382951 43.666293, -79.387973
1002 43.662352, -79.382951 43.668271, -79.376153
1003 43.662352, -79.382951 43.669737, -79.394470

here how to calculate distance from Target coordinates to each coordinate by passing Id and showing in a table using asp.net web form(c#)

Thanks in advance
Learning Rocks

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