Hi Suresh,
Thanks for using Syncfusion support.
We were unable to reproduced the reported issue at our end and we have prepared a sample for your convenience which can be download from following link,
In this sample, we have enable the Excel exporting and please refer to the following screenshot of the reference folder for what dll’s are required to Export,
Screenshot:
If you still face the same issue, then could you please provide following details?
1) Share the Gird and code behind Export code example.
2) Share the screenshot of the exception.
3) Issue reproducing scenario.
4) Are you rendered the Grid within update panel? If so, please refer to the following KB,
5) A sample if possible or modified the given sample as issue reproducible.
Regards,
Venkatesh Ayothiraman.