title: how to Download a single file with multi-Threads in C#
body: <p>I want to download a single file with Multi-Threads in C#.
  e.g:
  Thread1 start downloading from 1% to 40%.
  Thread2 start downloading from 41% to 70%.
  Thread3 start downloading from 71% to 100%</p>
  
  <p>Please suggest me some code. Thanks in advance</p>