How to get current location radius in Xamarin.Forms?

Hi everybody!
I have a Table in SQLite have 3 columns (LocationName, Latitude, Longtitude)
I want to load data to a ListView filter by current location radius
Ex: I set Radius is 1Km, I want load data aground my location in 1Km radius!
If you have a best way to do that, please suggest me, Thank you!