title: Get SUM of DataTable column
body: <p>I have following values in DataTable </p>
  
  <pre><code>Affiliate Name | Call
  ---------------|-----
  A              |   2
  B              |   1  
  B              |   0
  A              |   3
  </code></pre>
  
  <p>How can I retrieve Total Count of <code>Call</code> against <code>Affiliate Name</code> 'A'. In example above, it should return 5.</p>
  
  <pre><code>foreach (DataRow row in dt.Rows)
  {
      string CallsOffered = //Get count
  }
  </code></pre>