this.crystalReportViewer1.Navigate += new CrystalDecisions.Windows.Forms.NavigateEventHandler(this.crystalReportViewer1_Navigate);


private void crystalReportViewer1_Navigate(object source, CrystalDecisions.Windows.Forms.NavigateEventArgs e)
        {
            Label1.Text = "pagina : " + e.NewPageNumber; 
        }