Oriented sketch on each face of rectangle

[dayanandr1]

Hello All,

I have created a code which will create pocket on each face of a rectangle( which also I have created using extrude feature). while iterating over faces it is throwing exception for ( rng = faceEval.ParamRangeRect;) this line.
can anyone please suggest appropriate way to create pocket on each face.

private void btnCreateRectangle_Click(object sender, EventArgs e)

        {

            try

            {

                string template = myApp.FileManager.GetTemplateFile(DocumentTypeEnum.kPartDocumentObject, SystemOfMeasureEnum.kMetricSystemOfMeasure);

                PartDocument prtDoc = myApp.Documents.Add(DocumentTypeEnum.kPartDocumentObject, template) as PartDocument;

                prtDoc = myApp.ActiveDocument as PartDocument;

                PartComponentDefinition partDef = prtDoc.ComponentDefinition;

                TransientGeometry tGeometry = myApp.TransientGeometry;

                PlanarSketch sketch = partDef.Sketches.Add(partDef.WorkPlanes[3]);

                var rectangle = sketch.SketchLines.AddAsTwoPointCenteredRectangle(tGeometry.CreatePoint2d(0, 0), tGeometry.CreatePoint2d(50, 25));

                Profile profile = sketch.Profiles.AddForSolid();

                ExtrudeDefinition ExtrudeDef = partDef.Features.ExtrudeFeatures.CreateExtrudeDefinition(profile, PartFeatureOperationEnum.kJoinOperation);

                ExtrudeDef.SetDistanceExtent(30, PartFeatureExtentDirectionEnum.kPositiveExtentDirection);

                ExtrudeFeature extrude = partDef.Features.ExtrudeFeatures.Add(ExtrudeDef);

                EdgeCollection edges = myApp.TransientObjects.CreateEdgeCollection();

                foreach (Face item in extrude.Faces)

                {

                    if (item.Edges != null)

                        foreach (Edge edge in item.Edges)

                        {

                            edges.Add(edge);

                        }

                }

                Point2d center = null;

                LineSegment xline= null;

                Box2d rng = null;

                foreach (Face face in extrude.Faces)

                {

                    if (face.SurfaceType == SurfaceTypeEnum.kPlaneSurface)

                    {

                        SurfaceEvaluator faceEval = face.Evaluator;

                        rng = faceEval.ParamRangeRect;

                        double X = rng.MinPoint.X + ((rng.MaxPoint.X - rng.MinPoint.X) / 2);

                        double Y = rng.MinPoint.Y + ((rng.MaxPoint.Y - rng.MinPoint.Y) / 2);

                        center = tGeometry.CreatePoint2d(X, Y);                       

                    }

                    Vertex vert = face.Edges[2].StartVertex;

                    Edge edge = face.Edges[2];

                    PlanarSketch sketchOnRect = partDef.Sketches.AddWithOrientation(face, edge, true,false, vert, true);

                    var rect = sketchOnRect.SketchLines.AddAsTwoPointCenteredRectangle(center, tGeometry.CreatePoint2d(center.X+5, center.Y+ 5));

                    Profile pf = sketchOnRect.Profiles.AddForSolid();

                    ExtrudeDefinition exDef = partDef.Features.ExtrudeFeatures.CreateExtrudeDefinition(pf, PartFeatureOperationEnum.kCutOperation);

                    exDef.SetDistanceExtent(5, PartFeatureExtentDirectionEnum.kNegativeExtentDirection);

                    ExtrudeFeature pocket = partDef.Features.ExtrudeFeatures.Add(exDef);

                }

                FilletFeature fillet = partDef.Features.FilletFeatures.AddSimple(edges, 1);

                prtDoc.Update();

                Camera camera = myApp.ActiveView.Camera;

                camera.Fit();

                camera.Apply();

            }

            catch (Exception ex)

            {

            }

        }