Calculate Center Point from List of Latitude and Longitude using C# and JavaScript in ASP.Net

How to get the center of a list of locations in latitude and longitude

For a real estate project I have got an undefined number of geographical locations in latitude and longitude for each houses.

I would like to show on a map powered by mapbox. I want to pass to the JavaScript the center point in lat and lng.

How do I calculate it? 

I read some questions but none worked for me as I need it in vb.net.