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    <p>Lets start by getting the average time between B's start and finish:</p> <p>1) You first need the time difference between the start and finish of each B object so you would do this:</p> <pre><code>List&lt;TimeSpan&gt; timeSpans = new List&lt;TimeSpan&gt;(); foreach (B myB in BList) { TimeSpan myTimeSpan = myB.CompletedDate.Subtract(myB.CreatedDate); timeSpans.Add(myTimeSpan); } </code></pre> <p>2) You now need to get the average of this. You can do this by using lambda expressions:</p> <pre><code>//This will give you the average time it took to complete a task in minutes Double averageTimeOfB = timeSpans.average(timeSpan =&gt; timeSpan.TotalMinutes); </code></pre> <p>You can now do the same thing to get the average time between A's start and B's finish as follows:</p> <p>1)Get the time difference for A's start date and each of B's completion date:</p> <pre><code> List&lt;TimeSpan&gt; timeSpans_2 = new List&lt;TimeSpan&gt;(); foreach (B myB in BList) { TimeSpan myTimeSpan = myB.CompletedDate.Subtract(objectA.CreatedDate); timeSpans_2.Add(myTimeSpan); } </code></pre> <p>2) Get the average of these time differnces exactly like the one above:</p> <pre><code>//This will give you the average time it took to complete a task in minutes Double averageTimeOfAandB = timeSpans_2.average(timeSpan =&gt; timeSpan.TotalMinutes); </code></pre> <p>And you're done. I hope that this helps. Please note that this code has not been tested.</p> <p>EDIT: Remember that LINQ uses Lamda Expressions but is more of syntactic sugar (don't know much about the implementation so I hope you don't hold it against me). And also you could wrap the implementaions I provide in methods so that you can call them multiple times for a List of A objects.</p>
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    1. POLinq - calculate multiple averages in one query
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    1. COThanks, this will indeed do the job. However as I've got 9 average/min/max etc type things to calculate from this data, I was wondering if it could all be done inside one Linq query, similar to the original SQL .
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    2. COoops, just saw your edit. It looks like this will be the easiest way. I saw the Average methods in Linq and thought they might be the way forward. But maybe not.
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    3. COSorry getting a bit confused , you mean that given an object of type A you want to calculate not only the average but also the min/max..etc?
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