Modify the surfaces from NURB surfaces

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Hiii.....I want to modify the shape of surface and for that I require the contour points or vertex of the surface . Here attaching the code .

PartDocument doc = (PartDocument)mApplication.ActiveDocument;
PartComponentDefinition compDef = doc.ComponentDefinition;
SurfaceBody body = compDef.SurfaceBodies[1];
Face f = body.Faces[1];
SurfaceBody nurbsBody = null;
nurbsBody = f.AlternateBody[4];
Vertex vc = nurbsBody.Vertices[2] ;

Here I got vertex as (0,0,0) only.Can anyone help me with this