title: How do I update a time value back to NULL on a column with data type time(7)
body: <p>Let's say I key in 11:55 in a textbox and submit it over to the database.  But when it comes to editing part (update), how I make the value back to null?</p>
  
  <p>This is my code so far:</p>
  
  <pre><code>DateTime meetingTime;
  DateTime.TryParseExact(txtMeetTime.Text, new string[] { "H:mm" },
            System.Globalization.CultureInfo.InvariantCulture,
            System.Globalization.DateTimeStyles.None,
            out meetingTime);
  cmd.Parameters.AddWithValue("@updateTime", meetingTime);
  </code></pre>