How can save Viso drawing in csharp

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C#

Visio

I just created a application the custom version of VISIO .Here a can draw the symbols using Viso Drawing Control but i want to save this drawing into a image file.

How can I do it? Code is given below:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Microsoft.Office.Interop.Visio;
using System.Collections;

namespace SmartUML
{
    public partial class frmCanvas : Form
    {
        Document currentStencil,p;
        Window stencilWindow,d;
        public frmCanvas()
        {
            InitializeComponent();
        }

        private void frmCanvas_Load(object sender, EventArgs e)

        {
            string ApplicationPath = System.Windows.Forms.Application.StartupPath + @"\Umls\";
            Microsoft.Office.Interop.Visio.Application app = this.axDrawingControl1.Document.Application;
            app.Addons.Add(ApplicationPath + "\\UML.VSL");  
            app.Documents.Add(ApplicationPath + "\\UMLMOD_U.VST"); 
            DrawCurrentShape(CoreLib.CurrentFile);
        }
       

        public void DrawCurrentShape(string currentSelection)
        {
            string ApplicationPath = System.Windows.Forms.Application.StartupPath + @"\Umls\";

            currentStencil = axDrawingControl1.Document.Application.Documents.OpenEx(currentSelection, (short)VisOpenSaveArgs.visOpenDocked);
            Page currentPage = axDrawingControl1.Document.Pages[1];
            stencilWindow = currentPage.Document.OpenStencilWindow();
        }

        private void frmCanvas_FormClosed(object sender, FormClosedEventArgs e)
        {
            System.Windows.Forms.Application.Exit();
        }

        private void saveToolStripMenuItem1_Click(object sender, EventArgs e)
        {
           // Here i want to write the code for Saving
        }
    }
}