LINQ: Distinct values

Question

I have the following item set from an XML:

id           category

5            1
5            3
5            4
5            3
5            3

<

Answer 1

In addition to Jon Skeet's answer, you can also use the group by expressions to get the unique groups along w/ a count for each groups iterations:

var query = from e in doc.Elements("whatever")
            group e by new { id = e.Key, val = e.Value } into g
            select new { id = g.Key.id, val = g.Key.val, count = g.Count() };