# Construct Line Example (C#)

This example shows how to construct a Line.

    //--------------------------------------------------------------
    // 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 Line is
    // constructed and its color changed 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);
            Line dsLine = default(Line);
            Color dsColor = default(Color);
            double startX = 0;
            double startY = 0;
            double startZ = 0;
            double endX = 0;
            double endY = 0;
            double endZ = 0;

            //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();

                //Line parameters
                startX = 1.0;
                startY = 1.0;
                startZ = 0.0;
                endX = 6.0;
                endY = 1.0;
                endZ = 0.0;
                //Construct a Line
                dsLine = (dsSketchManager.InsertLine(startX, startY, startZ, endX, endY, endZ);

                if (dsLine != null)
                {

                    //Change line's color
                    dsColor = dsLine.Color;
                    dsColor.SetNamedColor(dsNamedColor_e.dsNamedColor_Red);
                    dsLine.Color = dsColor;

                    MessageBox.Show("Line was added to drawing and its color changed to red.");
                }
            }
            else
            {
                MessageBox.Show("There are no open documents in DraftSight.");
            }
        }
    }