public void ExporttoExcel(DataTable table, string filename)
    {
        HttpContext.Current.Response.Clear();
        HttpContext.Current.Response.ClearContent();
        HttpContext.Current.Response.ClearHeaders();
        HttpContext.Current.Response.Buffer = true;
        HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.UTF8;
        HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.NoCache);
        HttpContext.Current.Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
        HttpContext.Current.Response.AddHeader("content-disposition", "attachment;filename=Resultados_Finales.xlsx");

        using (ExcelPackage pack = new ExcelPackage())
        {
            ExcelWorksheet ws = pack.Workbook.Worksheets.Add(filename);
            ws.Cells["A1"].LoadFromDataTable(table, true);
            ws.Cells[ws.Dimension.Address].AutoFitColumns();
            ws.Column(74).Style.Locked = false;
            ws.Column(75).Style.Locked = false;
            ws.Column(88).Style.Locked = false;
            ws.Column(89).Style.Locked = false;
            ws.Column(90).Style.Locked = false;
            ws.Column(91).Style.Locked = false;
            ws.Column(92).Style.Locked = false;
            ws.Column(93).Style.Locked = false;
            ws.Column(94).Style.Locked = false;
            ws.Cells["BV1:BW1"].Style.Locked = true;
            ws.Cells["CJ1:CP1"].Style.Locked = true;
            ws.Protection.IsProtected = true;
            var ms = new System.IO.MemoryStream();
            pack.SaveAs(ms);
            ms.WriteTo(HttpContext.Current.Response.OutputStream);
        }

        HttpContext.Current.Response.Flush();
        HttpContext.Current.Response.End();

    }