title: Telegram BOT Api: how to send a photo using C#?
body: <p>The sendPhoto command require an argument photo defined as InputFile or String.</p>
  
  <p>The API doc tells:</p>
  
  <p>Photo to send. You can either pass a file_id as String to resend a photo
  that is already on the Telegram servers, or upload a new photo using
  multipart/form-data.
  And</p>
  
  <p>InputFile</p>
  
  <p>This object represents the contents of a file to be uploaded. Must be
  posted using multipart/form-data in the usual way that files are 
  uploaded via the browser.</p>