Group By Multiple Columns - LINQ?

Use an anonymous type. Eg group x by new { x. Column1, x.

Column2 }.

10 ,good answer – DeveloperX Nov 13 '11 at 18:38.

Ok got this as: var query = (from t in Transactions group t by new {t. MaterialID, t. ProductID} into grp select new { grp.Key.

MaterialID, grp.Key. ProductID, Quantity = grp. Sum(t => t.

Quantity) }).ToList().

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