title: How to select from List of KeyValuePair?
body: <p>I have a list of KeyValuePair (Key is string type and value is int type). And I want to return the key value pair list which will get my matching criteria
                       example : return a list where Key = "A" and Value = 10.</p>
  
  <p>How select will work on this and how to write the expression to get my required result ?</p>