title: Find invalid dates in DataTable Using LINQ
body: <p>I have a <code>DataTable</code> (that was loaded from EXCEL) with a Date column.</p>
  
  <p>I need to validate that the date column is valid, and if not return number of invalid dates.</p>
  
  <p>For example:</p>
  
  <pre><code>Col1  ColDate
  ---------------
  k1     21/11/2016
  
  k2     25/10/1975
  
  k3     31/2/2016
  
  k4     abcd
  </code></pre>
  
  <p>The above table should return 2 (cause the last two rows contains invalid dates).</p>
  
  <p>How can I find the invalid rows using LINQ</p>