Create 2D Spline Example (C#)

//---------------------------------------------------------------------------
// Preconditions: Open a new part.
//
// Postconditions:
// 1. Creates a sketch of a 2D spline.
// 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;
using System.Runtime.InteropServices;
namespace Create2DSpline_CSharp.csproj
{
    partial class SolidWorksMacro
    {

        ModelDoc2 swModelDoc;
        ModelDocExtension swModelDocExt;
        int i;
        int j;
        double[] x = new double[6];
        double[] y = new double[6];

        bool boolstatus;

        public void Main()
        {
            swModelDoc = (ModelDoc2)swApp.ActiveDoc;
            swModelDocExt = swModelDoc.Extension;
            boolstatus = swModelDocExt.SelectByID2("Front Plane", "PLANE", 0, 0, 0, false, 0, null, 0);

            // Open sketch
            swModelDoc.InsertSketch2(true);

            // Calculate the values for x, y, and z

            for (i = 0; i <= 4; i++)
            {
                x[i] = i;
                y[i] = Math.Pow(i, 2) + 3 * i;
            }

            // Initialize the routine and sketch the first point of the spline at 0,0,0
            swModelDoc.SketchSpline(-1, 0, 0, 0);

            // Sketch four more points of the spline
            for (j = 4; j >= 0; j += -1)
            {
                swModelDoc.SketchSpline(j, x[j], y[j], 0);
            }

            // Exit sketch
            swModelDoc.InsertSketch2(true);

        }



        public SldWorks swApp;

    }
}