title: How to delete cassandra row with bad primary key, since Cassandra C# Driver Complains Timestamp type column out of range
body: <p>I have a piece of C# code like this,</p>
  
  <pre><code>RowSet rows = cassandraSession.Execute("select * from mytable");
  foreach( var row in rows)
  {
      DateTimeOffset dt = (DateTimeOffset)row["last_modified"];
      // Construct the primary key and delete an row ....
  }
  </code></pre>
  
  <p>when I insert data into mytable, I put DateTime.UtcNow.Ticks as the value of column "last_modified" [timestamp]. However, when the code above runs, it always throws ArgumentOutOfRangeException in the row["last_modified"]. </p>
  
  <p>Unfortunately, last_modified is part of the primary key and I cannot query it out and delete now.</p>
  
  <p>Any thoughts and solutions?</p>