SaveChart(objWorkBook, chtMgr_Mod_Exp, "Mgr-Charts");

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private void SaveChart(Workbook w, Infragistics.Win.UltraWinChart.UltraChart ChartCtrl, string Sheetname)
        {
            Worksheet s = w.Worksheets.Add(Sheetname);
            System.IO.MemoryStream ms = new System.IO.MemoryStream();

            ChartCtrl.SaveTo(ms, System.Drawing.Imaging.ImageFormat.Png);

            WorksheetImage i = new WorksheetImage(System.Drawing.Image.FromStream(ms));
            //s.Rows[0].Cells[0].Value = "Blue Zone : " + dtpFromDate.DateTime.ToString("dd-MMM-yy");
            //s.Rows[1].Cells[0].Value = "Red Zone : " + dtpToDate.DateTime.ToString("dd-MMM-yy");
            i.TopLeftCornerCell = s.Rows[0].Cells[0];
            i.TopLeftCornerPosition = new PointF(0.0F, 0.0F);
            i.BottomRightCornerCell = s.Rows[22].Cells[9];
            i.BottomRightCornerPosition = new PointF(0.0F, 0.0F);
            s.Shapes.Add(i);
        }