Group by linq multiple columns C#

Group by linq multiple columns C# -

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 =&gt; t.Quantity)
                    }).ToList();

linq group by multiple -

.GroupBy(x =&gt; new { x.Column1, x.Column2 })

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Group by linq multiple columns C#

Group by linq multiple columns C# -

linq group by multiple -

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