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  1. PO
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    <p>I've tried to rewrite your code, but it isn't an easy task and I'm not sure if it works. I have set the binding of each column to a sequential index of an array <code>Keywords["+i+"]"</code> instead of <code>documents_keywords.FirstOrDefault(</code> and have changed a structure of the ItemSource. </p> <p>I have no opportunity to check this code myself, so if you have any problems - write them in the comment section.</p> <pre><code> DataGrid dataGrid = new DataGrid(); dataGrid.Columns.Add(new DataGridTextColumn { Header = "Title", Binding = new Binding("title") }); //all possible keywords var items = db.keywords.Select(k =&gt; new {Id = k.keyword_id, Name = k.name}).ToArray(); //selected keywords ordered by id var selected = (from item in items where keywordsListBox.SelectedItems.Contains(item.Name) orderby item.Id select item) .ToArray(); //create columns and bind them for(int i = 0; i &lt; selected.Length; i++) { dataGrid.Columns.Add(new DataGridTextColumn { Header = selected[i].Name, Binding = new Binding("Keywords["+i+"]") }); } var documents = (from d in db.documents select new{ d.title, //All related keywords Keywords = d.documents_keywords.Select(dk =&gt; new { Id = dk.keywoard_id, Value = dk.value}) .ToList()}) .AsEnumerable() .Select(doc =&gt; new { title = doc.title, //Only selected keywords with default null values Keywords = (from si in selected join k in doc.Keywords on si.Id equals k.Id into j from ji in j.DefaultIfEmpty(new { Id = si.Id, Value = null}) orderby ji.Id select ji.Value) .ToArray() }); dataGrid.ItemsSource = documents.ToList(); </code></pre>
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    1. POLINQ many-to-many in WPF databinding path
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    1. USvorrtex
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    1. COsorry for the late response - this project is far down the priorities list and i'm just getting back to it. your solution errors on the last line, but given the complexity i think i'll try a different approach. thank you!
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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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