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    <p>Here's some code that will do the work, using Linq. I don't know if it's in the form you were looking for, but the logic works with the data you gave us. You ought to be able to rearrange it into the proper shape for your app.</p> <p><strong>MODIFIED</strong></p> <pre><code>var rows = new[] { new { Id = 1, Name="Mike", TaskName="task1", StartTime=DateTime.Parse("2009-07-28 09:00:00"), EndTime=DateTime.Parse("2009-07-28 09:45:00") }, new { Id = 2, Name="Mike", TaskName="task2", StartTime=DateTime.Parse("2009-07-28 09:30:00"), EndTime=DateTime.Parse("2009-07-28 09:40:00") }, new { Id = 3, Name="Mike", TaskName="task3", StartTime=DateTime.Parse("2009-07-28 09:50:00"), EndTime=DateTime.Parse("2009-07-28 10:30:00") }, new { Id = 4, Name="Mike", TaskName="task4", StartTime=DateTime.Parse("2009-07-28 10:20:00"), EndTime=DateTime.Parse("2009-07-28 10:30:00") }, new { Id = 5, Name="Mike", TaskName="task5", StartTime=DateTime.Parse("2009-07-28 10:40:00"), EndTime=DateTime.Parse("2009-07-28 11:50:00") }, }; var ranges = rows.Select(x =&gt; new { StartTime = x.StartTime, EndTime = x.EndTime }); int rangeCount = 0; while (ranges.Count() != rangeCount) { rangeCount = ranges.Count(); ranges = ranges.Select(x =&gt; new { StartTime = ranges.Where(y =&gt; (y.StartTime &lt;= x.StartTime &amp;&amp; y.EndTime &gt;= x.StartTime) || (y.StartTime &lt;= x.EndTime &amp;&amp; y.EndTime &gt;= x.EndTime)).Min(y =&gt; y.StartTime), EndTime = ranges.Where(y =&gt; (y.StartTime &lt;= x.StartTime &amp;&amp; y.EndTime &gt;= x.StartTime) || (y.StartTime &lt;= x.EndTime &amp;&amp; y.EndTime &gt;= x.EndTime)).Max(y =&gt; y.EndTime), }).Distinct().ToList(); // ToList required to avoid recursion issues } TimeSpan gapTime = ranges.Max(x =&gt; x.EndTime) - ranges.Min(x =&gt; x.StartTime) - new TimeSpan(ranges.Sum(x =&gt; (x.EndTime - x.StartTime).Ticks)); System.Diagnostics.Trace.WriteLine(gapTime); </code></pre>
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    1. POHow to use Linq To Sql to count the idle working duration in a day?
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    1. USJohn Fisher
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    1. COif the task1 data is: StartTime=2009-07-28 09:00:00 EndTime=2009-07-28 09:50:00 then the result is wrong.
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    2. COI see the problem. With the code above, you would need to recursively calculate the ranges until the ranges couldn't be reduced. Hopefully, I'll have a better version after I can work on it again in a few hours.
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    3. COMy latest edit added a loop, which recursively merges the ranges until only the appropriate items are left. This should handle whatever data you throw at it.
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