title: Numeric fields lose leading zero while writing CSV in c#
body: <p>I'm using an ASP.NET application which exports my clients data to CSV, I need my clients Phone number to be with the leading Zero.
  I need the phone numbers to be without "-" and without quotations, and due to the nature of my application I cannot use 3rd party products such as EPPLUS.
  I've tried to put a space and let the CSV "understand" that I need the phone number as text , but that doesn't seem right. </p>
  
  <p>I would like to know how to make the excel include the leading zero , without using 3rd party products.</p>
  
  <p>Thanks</p>