I am trying to find out where the edges of the WindowRect are on a XamMap. I am going to use the latitude and longitude of the edges of the map, so that I can retrieve from the server only the data that is in the current viewable area. However, when I get the X coordinate, which I would think is the longitude, I get a number like "-13095675.841287203". This is obviously not the longitude in degrees like I need. What do I need to do to get the units in degrees? All of the examples I've seen so far have been for geometry types, but I am using the geography type.

This is the XAML for my reader:

<ig:MapLayer.Reader>
    <ig:SqlShapeReader DataMapping="Data=geogText; APN,Name=parcel; Address=situsLine1" >
        <ig:SqlShapeReader.CoordinateSystem>
            <ig:CoordinateSystem>
                <ig:CoordinateSystem.Geocs>
                    <ig:Geocs EllipsoidType="NAD83" />
                </ig:CoordinateSystem.Geocs>
            </ig:CoordinateSystem>
        </ig:SqlShapeReader.CoordinateSystem>
    </ig:SqlShapeReader>
</ig:MapLayer.Reader>

There is no projection, because it isn't being projected onto a flat surface. The data is stored with an SRID/EPSG of 4269.

Thank you,

Russell