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    <p>Just posting this for completeness sake, this is the adjusted code that Mert Erol came up with in the accepted answer. I believe that there was a miscommunication about whether ID numbers are required or not. They are not.</p> <p>The DataTable DataRows contain a ItemArray where the first column is the DateTime and the second column is the DataValue.</p> <p>Here's Merl's code wrapped into a function that I am now using. Thanks again Mert, I'd give you a few more upvotes if I could!</p> <p><strong>EDIT: UPDATED</strong> for correct handling of cases where data is missing for multiple days. Using <code>TimeSpan</code> seemed most appropriate to get an accurate count of hours between data points.</p> <pre><code>public DataTable fillMissingHours(DataTable currentDataTable) { // iterates through the current DataTable to find missing data and fill it in with // the correct DateTime and NULL DataValue DataRow row; DateTime curRowDt, nextRowDt; object curObj, nextObj; // Used only for conversions for (int i = 0; i &lt; currentDataTable.Rows.Count - 1; ++i) { curObj = currentDataTable.Rows[i][0]; nextObj = currentDataTable.Rows[i + 1][0]; curRowDt = Convert.ToDateTime(curObj); nextRowDt = Convert.ToDateTime(nextObj); if (curRowDt.AddHours(1.0) != nextRowDt) { TimeSpan deltaTime = nextRowDt - curRowDt; for (int j = 1; j &lt; deltaTime.TotalHours; ++j) { ++i; row = currentDataTable.NewRow(); row.ItemArray = new object[] { curRowDt.AddHours(j), null }; currentDataTable.Rows.InsertAt(row, i); } } } return currentDataTable; } </code></pre>
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    1. POdiscontinious hourly data in datatable, possible to insert missing hours datetime value and null for datavalue?
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