Is Selected Feature a Boundary Box Sketch (C#)

This example shows how to determine if a sketch is  a boundary box sketch.

//----------------------------------------------------------
// Preconditions:
// 1. Specified model exists.
// 2. Open the Immediate window.
// 3. Run the macro.
//
// Postconditions:
// 1. Specified model is opened.
// 2. Flat-Pattern1 feature is unsuppressed.
// 3. Flat-Pattern1's boundary box sketch feature is selected.
// 4. Whether the selected sketch is a boundary box sketch is
// written to the Immediate window.
//
// NOTES: Do not save any changes made to the model when closing
// the model.
//----------------------------------------------------------
using SolidWorks.Interop.sldworks;
using SolidWorks.Interop.swconst;
using System;
using System.Diagnostics;

namespace IsBoundaryBoxSketchSketchCSharp.csproj
{

    partial class SolidWorksMacro
    {

        public void Main()
        {

            ModelDoc2 swModel;
            ModelDocExtension swModelDocExt;
            SelectionMgr swSelMgr;
            Feature swFeature;
            Sketch swSketch;
            bool status = false;
            int errors = 0;
            int warnings = 0;

            // Open a sheet metal part
            swModel = (ModelDoc2)swApp.OpenDoc6("C:\\Program Files\\SolidWorks Corp\\SolidWorks\\samples\\design portfolio\\sheet_metal_bracket.sldprt", (int)swDocumentTypes_e.swDocPART, (int)swOpenDocOptions_e.swOpenDocOptions_Silent, "", ref errors, ref warnings);

            // Select the flat-pattern feature
            swModelDocExt = (ModelDocExtension)swModel.Extension;
            status = swModelDocExt.SelectByID2("Flat-Pattern1", "BODYFEATURE", 0, 0, 0, false, 0, null, 0);

            // Unsuppress the flat-pattern feature
            status = swModel.EditUnsuppress2();
            swModel.ClearSelection2(true);

            // Select the flat-pattern features's boundary box feature
            status = swModelDocExt.SelectByID2("Bounding-Box1", "SKETCH", 0, 0, 0, false, 0, null, 0);
            swSelMgr = (SelectionMgr)swModel.SelectionManager;
            swFeature = (Feature)swSelMgr.GetSelectedObject6(1, -1);
            swSketch = (Sketch)swFeature.GetSpecificFeature2();

            // Print to the Immediate window if the just-selected feature is a boundary box

            Debug.Print("Selected sketch a boundary box sketch? " + swSketch.IsBoundaryBoxSketch());
        }

        /// <summary>
        /// The SldWorks swApp variable is pre-assigned for you.
        /// </summary>
        public SldWorks swApp;


    }

}