score:2
Accepted answer
Grouping by each property individually will result in the same as a concatenated grouping
SomeList.GroupBy(x => new {x.Code, x.Location});
score:0
To answer your specific question
Is there a way to temporarily concatenate variables in a
GroupBy...
someList.GroupBy(x => new { TempConcat = x.Code + x.Location })
However I believe the answer by NinjaNye is better for what you want, rather than what you asked for :).
Source: stackoverflow.com
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