Hi Ram,
Thank you for using syncfusion products.
We can create an excel file in read - only mode. i have given below the code.
Iworkbook workbook=application.workbooks.OpenReadOnly(filename);
and it does not override any setting of an worksheet.
To save an readonly i have attached here with the sample, where we have to change the FileAttributes and write it to the file, then only we can save it.
Please try the sample and let us know if this helps you.
Pleae let us know if you require any further clarifications.
Thanks,
Sridhar.S
OpenReadonlyfile_6a4d2ee1.zip