Here's the location usage in NerdDinner sample that we could  modify with the geography data type as per the previous post:


        public IQueryable<Dinner> FindByLocation(float latitude, float longitude)
        {
            var dinners = from dinner in FindUpcomingDinners()
                          join i in NearestDinners(latitude, longitude)
                          on dinner.DinnerID equals i.DinnerID
                          select dinner;

            return dinners;
        }

/****** Object:  UserDefinedFunction [dbo].[NearestDinners]    Script Date: 7/30/2013 7:39:11 AM ******/
DROP FUNCTION [dbo].[NearestDinners]
GO

/****** Object:  UserDefinedFunction [dbo].[NearestDinners]    Script Date: 7/30/2013 7:39:11 AM ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

CREATE FUNCTION [dbo].[NearestDinners]
(
@lat real,
@long real
)
RETURNS  TABLE
AS
RETURN
SELECT     Dinners.DinnerID
FROM         Dinners
WHERE dbo.DistanceBetween(@lat, @long, Latitude, Longitude) <100

GO