How can I build a single instance application using Click Once?

namespace ClickOnceDemo
{
    static class Program
    {
        /// summary>
        /// The main entry point for the application.
        /// /summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault( false );
            bool ok;
            var m = new System.Threading.Mutex( true, "Application", out ok );
            if ( !ok )
            {
                MessageBox.Show( "Another instance is already running.", ApplicationDeployment.CurrentDeployment.CurrentVersion.ToString() );
                return;
            }
           Application.Run( new UpdateProgress() );
        }
    }
}

namespace ClickOnceDemo
{
public partial class UpdateProgress : Form
 {
  public UpdateProgress()
        {
            InitializeComponent();
            Text = "Checking for updates...";

            ApplicationDeployment ad = ApplicationDeployment.CurrentDeployment;
            ad.CheckForUpdateCompleted += OnCheckForUpdateCompleted;
            ad.CheckForUpdateProgressChanged += OnCheckForUpdateProgressChanged;

            ad.CheckForUpdateAsync();
       }

        private void OnCheckForUpdateProgressChanged(object sender, DeploymentProgressChangedEventArgs e)
        {
            lblStatus.Text = String.Format( "Downloading: {0}. {1:D}K of {2:D}K downloaded.", GetProgressString( e.State ), e.BytesCompleted / 1024, e.BytesTotal / 1024 );
            progressBar1.Value = e.ProgressPercentage;
        }

        string GetProgressString( DeploymentProgressState state )
        {
            if ( state == DeploymentProgressState.DownloadingApplicationFiles )
            {
                return "application files";
            }
            if ( state == DeploymentProgressState.DownloadingApplicationInformation )
            {
                return "application manifest";
            }
            return "deployment manifest";
        }

        private void OnCheckForUpdateCompleted(object sender, CheckForUpdateCompletedEventArgs e)
        {
            if ( e.Error != null )
            {
                MessageBox.Show( "ERROR: Could not retrieve new version of the application. Reason: n" + e.Error.Message + "nPlease report this error to the system administrator." );
                return;
            }
            if ( e.Cancelled )
            {
                MessageBox.Show( "The update was cancelled." );
            }

            // Ask the user if they would like to update the application now.
            if ( e.UpdateAvailable )
            {
                if ( !e.IsUpdateRequired )
                {
                    long updateSize = e.UpdateSizeBytes;
                    DialogResult dr = MessageBox.Show( string.Format("An update ({0}K) is available. Would you like to update the application now?", updateSize/1024), "Update Available", MessageBoxButtons.OKCancel );
                    if ( DialogResult.OK == dr )
                    {
                        BeginUpdate();
                    }
                }
                else
                {
                    MessageBox.Show( "A mandatory update is available for your application. We will install the update now, after which we will save all of your in-progress data and restart your application." );
                    BeginUpdate();
                }
            }
            else
            {
                ShowMainForm();
            }
        }

        // Show the main application form
        private void ShowMainForm()
        {
            MainForm mainForm = new MainForm ();
            mainForm.Show();
            Hide();
        }

        private void BeginUpdate()
        {
            Text = "Downloading update...";
            ApplicationDeployment ad = ApplicationDeployment.CurrentDeployment;
            ad.UpdateCompleted += ad_UpdateCompleted;
            ad.UpdateProgressChanged += ad_UpdateProgressChanged;

            ad.UpdateAsync();
        }

        void ad_UpdateProgressChanged( object sender, DeploymentProgressChangedEventArgs e )
        {
            String progressText = String.Format( "{0:D}K out of {1:D}K downloaded - {2:D}% complete", e.BytesCompleted / 1024, e.BytesTotal / 1024, e.ProgressPercentage );
            progressBar1.Value = e.ProgressPercentage;
            lblStatus.Text = progressText;
        }

        void ad_UpdateCompleted( object sender, AsyncCompletedEventArgs e )
        {
            if ( e.Cancelled )
            {
                MessageBox.Show( "The update of the application's latest version was cancelled." );
                return;
            }
            if ( e.Error != null )
            {
                MessageBox.Show( "ERROR: Could not install the latest version of the application. Reason: n" + e.Error.Message + "nPlease report this error to the system administrator." );
                return;
            }

            DialogResult dr = MessageBox.Show( "The application has been updated. Restart? (If you do not restart now, the new version will not take effect until after you quit and launch the application again.)", "Restart Application", MessageBoxButtons.OKCancel );
            if ( DialogResult.OK == dr )
            {
                Application.Restart();
            }
            else
            {
                ShowMainForm();
            }
        }
    }
}