How to get area center of the surface?

Rhino Developer
1

How can I get area center of the selected surface in c# script.

RhinoDoc activeDoc = RhinoDoc.ActiveDoc;

    IEnumerable<RhinoObject> brepObjects = activeDoc.Objects.GetObjectList(ObjectType.Brep);

    RhinoObject object1 = brepObjects.ElementAt(0);

    Brep body = Brep.TryConvertBrep(object1.Geometry);
    BrepFace surface = body.Faces.ElementAt(0);
....
how shall I continue
2

Check the area mass properties class and its static Compute function

https://developer.rhino3d.com/api/rhinocommon/rhino.geometry.areamassproperties/compute