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    <p>I haven't found the Linq solution but I can offer you a programmatic one. Note that I did this using full DateTime representation because of parsing instead of your that doesn't have year. Check the code:</p> <pre><code> //DataTable initialisation dt = new DataTable(); dt.Columns.Add("Column1"); dt.Columns.Add("Column2"); dt.Columns.Add("Column3"); dt.Rows.Add(new object[] { DateTime.Parse("6/10/2012 10:10"), 1, 0.1 }); dt.Rows.Add(new object[] { DateTime.Parse("6/10/2012 10:20"), 1, 0.1 }); dt.Rows.Add(new object[] { DateTime.Parse("6/10/2012 11:05"), 2, 0.1 }); dt.Rows.Add(new object[] { DateTime.Parse("6/10/2012 11:06"), 2, 0.1 }); dt.Rows.Add(new object[] { DateTime.Parse("6/10/2012 11:07"), 2, 0.1 }); dt.Rows.Add(new object[] { DateTime.Parse("6/10/2012 11:08"), 2, 0.1 }); dt.Rows.Add(new object[] { DateTime.Parse("6/10/2012 11:09"), 2, 0.1 }); dt.Rows.Add(new object[] { DateTime.Parse("6/10/2012 11:10"), 2, 0.1 }); dt.Rows.Add(new object[] { DateTime.Parse("6/10/2012 11:11"), 2, 0.1 }); dt.Rows.Add(new object[] { DateTime.Parse("6/10/2012 11:12"), 2, 0.1 }); dt.Rows.Add(new object[] { DateTime.Parse("6/10/2012 11:13"), 2, 0.1 }); //Method that groups data void GroupByDate() { DateTime startDate = DateTime.Parse(dt.Rows[0].ItemArray[0].ToString()); DateTime endDate = DateTime.Parse(dt.Rows[dt.Rows.Count - 1].ItemArray[0].ToString()); StringBuilder sb = new StringBuilder(); int rowIndex = 0; for (DateTime d = startDate.AddMinutes(-(startDate.Minute - 1) % 10); rowIndex &lt; dt.Rows.Count &amp;&amp; d &lt; endDate.AddMinutes(10 - endDate.Minute % 10); d = d.AddMinutes(10)) { double sum = 0; DateTime lastDateInSequence = new DateTime(); for (DateTime md = d;rowIndex &lt; dt.Rows.Count &amp;&amp; md &lt; d.AddMinutes(10); md = md.AddMinutes(1)) { DateTime inbetween = DateTime.Parse(dt.Rows[rowIndex].ItemArray[0].ToString()); if ( inbetween == md) { sum += double.Parse(dt.Rows[rowIndex].ItemArray[2].ToString()); lastDateInSequence = md; rowIndex++; } } if (sum &gt; 0.0) { // you can add this results to the new DataTable like dt1.Rows.Add(lastDateInSequence.ToString("dd/MM hh:mm"), dt.Rows[rowIndex - 1].ItemArray[1], sum); sb.Append(lastDateInSequence.ToString("dd/MM hh:mm") + " " + dt.Rows[rowIndex - 1].ItemArray[1].ToString() + " " + sum.ToString() + Environment.NewLine); } } MessageBox.Show(sb.ToString()); } </code></pre>
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    1. PODataTable adding rows based on time interval size
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    1. USNikola Davidovic
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    1. COThank you so much checking the code.
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    2. COGreat! it's working once again thank you Nick.
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    3. CONo problemo, glad the code helped you ;-)
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