title: How to find if the file is a CSV file?
body: <p>I have a scenario wherein the user uploads a file to the system. The only file that the system understands in a CSV, but the user can upload any type of file eg: jpeg, doc, html. I need to throw an exception if the user uploads anything other than CSV file. </p>
  
  <p>Can anybody let me know how can I find if the uploaded file is a CSV file or not?</p>