LINQ Group By with NULL database values

LINQ is fantastic for the ability to write queries that express intent much more clearly than the same SQL, or structured code. One problem that I have run into though is handling NULL database values that are part of a group by statement.

Grouping by ProductSKU

Grouping in LINQ allows you to return sets of data from a collection for a given key value. The group by clause is what the key ends up being in the result set. Let's take a grouping of the Products by the SKU.

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