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    <p>I am not sure if you would be interested to use a third party control, but I had EXACTLY SAME requirement of yours and needed to display the data hierarchically, showing repeating values as single one with collapsible nodes (like trees). However, Tree controls are not data bound and still needs a fair bit of coding. But this style of Tree building based on non-normalized data can be easily done with DataBinding. The FlexGrid I have used was DataBound to the DataTable and just needed a few lines of code to display EXACTLY what you require, albeit based on a Third Party Control.</p> <p>I have used the ComponentOne FlexGrid control and used its 'SubTotal' feature to generate the hierarchical data. I am pasting the code below, just in case you are interested to use the ComponentOne FlexGrid. You can download a Demo copy and check.</p> <pre><code> // Showing master policy in GROUPS // ----------------------------------------------------------------------------------- // set tree mode to show settings in GROUPS flxAvailableSettings.Tree.Style = TreeStyleFlags.Simple; // show outline tree on column 1. flxAvailableSettings.Tree.Column = 0; flxAvailableSettings.Cols[0].Visible = true; flxAvailableSettings.Cols[0].Width = 15; flxAvailableSettings.AllowMerging = AllowMergingEnum.Nodes; // subtotal on column 1, outline level 0 flxAvailableSettings.Subtotal(AggregateEnum.None, 0, 0, 0, "{0}"); // use owner draw to suppress repeating group names in Non-Node rows flxAvailableSettings.DrawMode = DrawModeEnum.OwnerDraw; flxAvailableSettings.OwnerDrawCell += new C1.Win.C1FlexGrid.OwnerDrawCellEventHandler(flxAvailableSettings_OwnerDrawCell); // done, autosize columns to finish flxAvailableSettings.AutoSizeCols(); // ----------------------------------------------------------------------------------- private void flxAvailableSettings_OwnerDrawCell(object sender, C1.Win.C1FlexGrid.OwnerDrawCellEventArgs e) { if (!flxAvailableSettings.Rows[e.Row].IsNode &amp;&amp; flxAvailableSettings.Cols[e.Col].Name == "PolicyGroup") e.Text = ""; } </code></pre> <p>The flxAvailableSettings.Subtotal(AggregateEnum.None, 0, 0, 0, "{0}") line generates the Tree Groups, though I needed to group on a single column, you can use groups on multiple columns. Just refer their docs example on Subtotalling.</p> <p>Hope this helps.</p>
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    1. POHow do I display non-normalized data in a hierarchical structure?
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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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