HRESULT: 0x80131468 - Download large excel file C#, .Net

On my website, excel download function is working fine for < 10k data rows. If the rows is about 25k, 30k, I receive the following error.

Unable to create the store directory. (Exception from HRESULT: 0x80131468)

And it's working fine on development server.

It could be something to do with the excel export engine do not have permission to temporary store the file to the IsolatedStorage Could you try to check if the user from Application Pool for that Website has permission on write on the follow directory [on the server] "*C:\Documents and Settings\Default User\Local Settings\Application Data\IsolatedStorage*"

If not, please modify the permission for that user for that folder.

Please correct me if my concept is wrong