Hi Sunil,
Thank you for your interest in Syncfusion products.
You can stream the excel file to browser which would directly open it in Excel. You may then save it as shown in the simple sample below.
http://help.syncfusion.com/samples/XlsIO.Web/8.1.0.30/F93660/F93660.zipPlease let me know if you have any questions.
Regards,
Geetha