# Construct 2D PolyLine Example (C#)

This example shows how to construct a 2D PolyLine in a drawing document.

    //--------------------------------------------------------------
    // Preconditions:
    // 1. Create a C# Windows console project.
    // 2. Copy and paste this example into the C# IDE.
    // 3. Add a reference to:
    //    install_dir\APISDK\tlb\DraftSight.Interop.dsAutomation.dll.
    // 4. Add references to System and System.Windows.Forms.
    // 5. Start DraftSight and open a document.
    // 6. Start debugging the project.
    //
    // Postconditions: A message box pops up when a 2D PolyLine is
    // inserted in the drawing document.
    //----------------------------------------------------------------
    using DraftSight.Interop.dsAutomation;
    using System;
    using System.Runtime.InteropServices;
    using System.Windows.Forms;
    static class Module1
    {
        public static void Main()
        {
            DraftSight.Interop.dsAutomation.Application dsApp;
            Document dsDoc = default(Document);
            Model dsModel = default(Model);
            SketchManager dsSketchManager = default(SketchManager);
            PolyLine dsPolyLine = default(PolyLine);
            double[] coordinates = new double[8];
            bool closed;

            //Connect to DraftSight
            dsApp = (DraftSight.Interop.dsAutomation.Application)Marshal.GetActiveObject("DraftSight.Application");
    	dsApp.AbortRunningCommand(); //abort any command currently running in DraftSight to avoid nested commands

            //Get active document
            dsDoc = dsApp.GetActiveDocument();

            if (dsDoc != null)
            {
                //Get model space
                dsModel = dsDoc.GetModel();

                //Get Sketch Manager
                dsSketchManager = dsModel.GetSketchManager();

                //2D PolyLine parameters
                coordinates[0] = 0.0;
                coordinates[1] = 2.0;
                coordinates[2] = 0.0;
                coordinates[3] = 0.0;
                coordinates[4] = 6.0;
                coordinates[5] = 0.0;
                coordinates[6] = 6.0;
                coordinates[7] = 2.0;
                closed = true;

                //Add a 2D PolyLine
                dsPolyLine = dsSketchManager.InsertPolyline2D(coordinates, closed);

                if (dsPolyLine != null)
                {
                    MessageBox.Show("2D PolyLine was added to drawing.");
                }
            }
            else
            {
                MessageBox.Show("There are no open documents in DraftSight.");
            }
        }
    }