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    <p>Sure, you're looking to perform a <em><a href="http://msdn.microsoft.com/en-us/library/bb918093.aspx" rel="nofollow">Full Outer Join</a></em> on the data, which doesn't exist in LINQ, so we fake it with two unioned Left Outer Joins:</p> <pre><code>var A = from a in List1 join b in List2 on new { a.Year, a.Month } equals new { b.Year, b.Month } into bgroup from b in bgroup.DefaultIfEmpty() select new { a.Year, a.Month, a.ValueA, ValueB = (b == null ? 0 : b.ValueB) }; var B = from b in List2 join a in List1 on new { b.Year, b.Month } equals new { a.Year, a.Month } into agroup from a in agroup.DefaultIfEmpty() select new { b.Year, b.Month, ValueA = (a == null ? 0 : a.ValueA), b.ValueB }; var List3 = A.Union(B); </code></pre> <p><em>Many apologies for the C#, I could not get my VB.Net example to work for the life of me. You need two left outer joins to be unioned to produce the correct answer. None of the code converters I tried worked either.</em></p> <hr> <p>The following is VB.Net that LINQPad chokes on, but every example I can find says should be correct:</p> <pre><code>Dim A = From a In List1 _ Group Join b In List2 _ On New With { a.Year, a.Month } Equals New With { b.Year, b.Month} _ Into bGroup = Group _ From b In bGroup.DefaultIfEmpty() _ Select a.Year, a.Month, a.ValueA, ValueB = If(b Is Nothing, 0, b.ValueB) Dim B = From b In List2 _ Group Join a In List1 _ On New With { b.Year, b.Month } Equals New With { a.Year, a.Month} _ Into aGroup = Group _ From a In aGroup.DefaultIfEmpty() _ Select b.Year, b.Month, ValueA = If(a Is Nothing, 0, a.ValueA), b.ValueB Dim List3 = A.Union(B) </code></pre>
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    1. COStandby, this may not work as it excludes items which do not have a match in their other collection.
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    2. COThanks for your suggestion, but this solution does not take into account values in List2 with no counterpart in List1 : in my example, 2010 - 8 - 1 in List2 will be lost.
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    3. CO@Joss57: I came to that conclusion right as you were posting that comment it seems. I've updated my sample to use a Full Outer Join.
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