How can i store latitude and longitude (of registered user locations) in sql server and how can i query it for finding locations inside X radius from point y (or any user)?

Hello
In my app (WP 8.1) i have to store user location (lat,lon) in sql db so how can i store that location detail? And i also have to find all the location which are inside certain radius X from another user location, How can i do this?
Any Sample project or code or any blog post?
P.S. I use sql server 2012.

If you need to do spatial queries like the one you mentioned you'd need to store it as a spatial geography type. For points, a simple SQL INSERT statement using the Point() method would do it. Example here:
http://msdn.microsoft.com/en-us/library/bb933811.aspx For locations inside a radius, you'd use STDistance() method. All of the methods for the geography data type are documented here:
http://msdn.microsoft.com/en-us/library/bb933802.aspx and can be used in ordinary T-SQL statements.
If you need to use the SQL Server spatial library in your .NET application direct, Alastair has some nice blog posts, like this one:
https://alastaira.wordpress.com/2011/08/19/spatial-applications-in-windows-azure-redux-including-denali/ , he even wrote a book. Or search the answers in this forum.
Hope this helps, Bob

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