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copied!<p>Just forgot the <code>ToList()</code>, to enumerate the ... enumerations when you do <code>o.Select(...)</code></p> <pre><code>var lpYear = ( from a in _ds.Tables[0].AsEnumerable() join b in LandingPages on a["OFFERINGKEY"].ToString() equals b.Code into c from d in c.DefaultIfEmpty() where DateTime.Parse(a["PURCHASEDATE"].ToString()) >= DateTime.Parse("January 1, " + year) where DateTime.Parse(a["PURCHASEDATE"].ToString()) >= DateTime.Parse("December 31, " + year) where LandingPages.Any(x => x.Code == a["OFFERINGKEY"].ToString()) orderby d.Title select new { title = d.Title, url = d.URL, price = a["PRICE"], purchased = a["PURCHASEDATE"].ToString() }).GroupBy(o => o.title) .Select(g => new { total = g.Sum(p => decimal.Parse(p.price.ToString())), count = g.Count(), title = g.Key, url = g.Select(p=>p.url).Distinct().Single(), code = g.Select(p=>p.code).Distinct().Single() } ); </code></pre> <p>In pure LINQ:</p> <pre><code>var lpYear = from o in (from a in _ds.Tables[0].AsEnumerable() join b in LandingPages on a["OFFERINGKEY"].ToString() equals b.Code into c from d in c.DefaultIfEmpty() where DateTime.Parse(a["PURCHASEDATE"].ToString()) >= DateTime.Parse("January 1, " + year) where DateTime.Parse(a["PURCHASEDATE"].ToString()) >= DateTime.Parse("December 31, " + year) where LandingPages.Any(x => x.Code == a["OFFERINGKEY"].ToString()) orderby d.Title select new { title = d.Title, url = d.URL, price = a["PRICE"], purchased = a["PURCHASEDATE"].ToString() }) group o by o.title into g select new { total = g.Sum(p => decimal.Parse(p.price.ToString())), count = g.Count(), title = g.Key, url = (from p in g select p.url).Distinct().Single(), code = (from p in g select p.code).Distinct().Single() }; </code></pre>

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