Hello,
Being a C# developer (for more than 5 years) and also worked with different file formats including .csv, .xlsx, .pdf, and .doc (I worked with iTextSharp library to parse pdf files as a part of working on one of the application), I would like to go through the detailed project requirements and see if I can help you with the same.
Please reply to this proposal, if you find it useful.
Regards,
Atul Rajdhar