Hi Hung,
Thank you very much for your interest on Syncfusion products.
Yes, In XlsIO we have property to get the active cell in the active window (the window on top) or in the specified window. Please make use of the below code snippet and let us know if this helps you. Also we have provided the online documentation link for the same.
[C#]
ExcelEngine engine = new ExcelEngine())
IApplication app = engine.Excel;
IWorkbook book = app.Workbooks.Open(@"../../Data.xlsx");
Console.WriteLine(app.ActiveCell.AddressLocal);
Online documentation link:
http://help.syncfusion.com/ug_93/Reporting/XlsIO/ASP.NET/index.htmPlease let us know if you need any clarifications.
Thanks,
Lokesh.