How to change size of cylinder surface?

[supriya_chaugule]

Hii....I want to change the size of cylinder surface or extrude that surface.Here attaching the code for extruding the plane surfaces .Can anyone help me for the cylindrical surface?                                                                                                        

PartDocument doc = (PartDocument)mApplication.ActiveDocument;
PartComponentDefinition compDef = doc.ComponentDefinition;
SurfaceBody body = compDef.SurfaceBodies[1];

foreach (Face top in body.Faces)
{

    PlanarSketches sketches = compDef.Sketches;
    PartFeatures feats = compDef.Features;
    //Face top = body.Faces[1];
    PlanarSketch sketch = sketches.Add(top, true);
    //sketch.Name = "TOP_SURFACE";

    Profile profile = sketch.Profiles.AddForSolid();

    ExtrudeDefinition def = feats.ExtrudeFeatures.CreateExtrudeDefinition(profile, PartFeatureOperationEnum.kSurfaceOperation);
    def.SetDistanceExtent(1, PartFeatureExtentDirectionEnum.kPositiveExtentDirection);

    ExtrudeFeature oExtrude = feats.ExtrudeFeatures.Add(def);
    //oExtrude.Name = "Test";
}