Select Chains of Entities Attached to a Sketch Segment Example (C#)

//----------------------------------------------------------------------------
// Preconditions:
// 1. Open a part that contains a sketch of a rectangle.
// 2. Select one sketch segment of the rectangle.
//
// Postconditions:
// 1. Selects all of the sketch segments of the rectangle.
// 2. Examine the graphics area.
// ---------------------------------------------------------------------------
using Microsoft.VisualBasic;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using SolidWorks.Interop.sldworks;
using SolidWorks.Interop.swconst;
namespace SelectChain_CSharp.csproj
{
    partial class SolidWorksMacro
    {
        ModelDoc2 Part;
        SelectionMgr SelMgr;
        SketchSegment sketchSegment;
        SelectData SelData;

        bool boolstatus;

        public void Main()
        {
            Part = (ModelDoc2)swApp.ActiveDoc;
            SelMgr = (SelectionMgr)Part.SelectionManager;
            SelData = (SelectData)SelMgr.CreateSelectData();
            boolstatus = Part.Extension.SelectByID2("Line3@Sketch2", "EXTSKETCHSEGMENT", -0.01022262320328, 0.01646364019604, 0, false, 0, null, 0);
            sketchSegment = (SketchSegment)SelMgr.GetSelectedObject6(1, -1);
            boolstatus = sketchSegment.SelectChain(true, SelData);

        }

        public SldWorks swApp;

    }
}