title: How to detect any NON UTF8 character in a file in C#?
body: <p>How can I identify all NON UTF8 characters from a given file?</p>
  
  <p>We need to write it in C# and be able to execute it in a SSIS environment. 
  After the execution we need to find out and check all the wrong occurrences given eventually their line number into the input file. </p>
  
  <p>Assumptions: 
  - file is a csv well formatted (in our case), 
  - new line has CR LF</p>