title: Invalid Uri: The Uri scheme is not valid
body: <p>I am trying to make a connection via HttpWebRequest. I am reading url links from a text file. 
  However, I am getting 'System.UriFormatException' error. </p>
  
  <p>I have tried to add http:// in front of the url links in my text file. But the result is the same. </p>
  
  <p>What can be the solution? </p>