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    <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()) &gt;= DateTime.Parse("January 1, " + year) where DateTime.Parse(a["PURCHASEDATE"].ToString()) &gt;= DateTime.Parse("December 31, " + year) where LandingPages.Any(x =&gt; 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 =&gt; o.title) .Select(g =&gt; new { total = g.Sum(p =&gt; decimal.Parse(p.price.ToString())), count = g.Count(), title = g.Key, url = g.Select(p=&gt;p.url).Distinct().Single(), code = g.Select(p=&gt;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()) &gt;= DateTime.Parse("January 1, " + year) where DateTime.Parse(a["PURCHASEDATE"].ToString()) &gt;= DateTime.Parse("December 31, " + year) where LandingPages.Any(x =&gt; 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 =&gt; 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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    1. POCombine results after join and groupby with DataTable and List<Object>
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POCombine results after join and groupby with DataTable and List<Object>
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    1. COAfter adding `.ToList()`, it returns the following for 'url' and 'purchased': `System.Collections.Generic.List`1[System.String]`
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    2. COYes, it is normal behavior because you are doing a grouping. _g_ can contain multiple elements that have different _price_ or _purchased_ values. If you are sure these values are the same for all the elements of the group _g_, use _Single_ instead of _ToList_.
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    3. COOkay, got it. `.Single()` produced an error, but `.First()` worked like a charm. Your "pure LINQ" example also works and does the same thing (it's missing a closing ')' on line 14). Thanks for your help!
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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