title: Running / Cumulative total in GridView column
body: <p>I was looking for a way to add a cumulative total column to my GridView that would show a cumulative total of one of the numeric columns in the row.  So basically:</p>
  
  <pre><code>Points | Running Total
  2      | 2
  1      | 3
  -0.5   | 2.5
  1.5    | 4
  </code></pre>
  
  <p>I saw some questions on <a href="https://stackoverflow.com/questions/860966/calculate-a-running-total-in-sqlserver/10309947#10309947">cumulative totals using SQL Server</a> and other databases, but I found nothing about strictly using GridView without changing any SQL, so I thought I would post my solution here.</p>