using Syncfusion.Pdf;
using Syncfusion.XlsIO;
using Syncfusion.XlsIORenderer;

using (ExcelEngine excelEngine = new ExcelEngine())
{
    IApplication application = excelEngine.Excel;

    //Initialize XlsIO renderer.
    XlsIORenderer renderer = new XlsIORenderer();

    //Get stream from an existing Excel file. 
    FileStream excelStream = new FileStream(Path.GetFullPath(@"Data/EmbeddedChart.xlsx"), FileMode.Open, FileAccess.Read);
    IWorkbook workbook = application.Workbooks.Open(excelStream);

    //Convert Excel document with charts into PDF document 
    PdfDocument pdfDocument = renderer.ConvertToPDF(workbook);

    //Save the PDF document.
    pdfDocument.Save(Path.GetFullPath(@"Output/Output.pdf"));

    excelStream.Dispose();

    //Close the PDF document. 
    pdfDocument.Close(true);
}