# Construct Circle Example (C#)

This example shows how to construct a Circle.

    //--------------------------------------------------------------
    // 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 Circle is
    // constructed 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);
    		Circle dsCircle = default(Circle);
    		double centerX = 0;
    		double centerY = 0;
    		double centerZ = 0;
    		double radius = 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();
    			//Circle parameters
    			centerX = 1.0;
    			centerY = 2.0;
    			centerZ = 0.0;
    			radius = 5.0;
    			//Construct a Circle
    			dsCircle = dsSketchManager.InsertCircle(centerX, centerY, centerZ, radius);
    			if ((dsCircle != null))
                            {
                                 MessageBox.Show("Circle was added to drawing.");
    			}
    		}
                    else
                    {
                            MessageBox.Show("There are no open documents in DraftSight.");
    		}

    	}
    }