get count of "yes" from my multiple objects of List<string>
<p>I want to get count of '<em>yes</em>' from my multiple objects of List(string). lets suppose I have three list <code>sig1</code>, <code>sig2</code> and <code>sig3</code> and they all contain either '<em>yes</em>' or '<em>no</em>'. and I want to get the count of '<em>yes</em>' from <code>sig1</code> where <code>sig2</code> is '<em>yes</em>' and <code>sig3</code> is '<em>no</em>'.</p>
