title: query ilist with linq
body: <p>I would like to get data with linq from ilist which has type of one class - for example - iList - everything I know, that in this iList are saved emails and names, but this iList has no string type, but this class. 
  How can I get them?
  It would be great to put this data to my own List
  Any hint how to do that?</p>