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    <p>OK, what you could do is persist your temporary list datasource in viewstate. Here's a rough example:</p> <pre><code>&lt;asp:ScriptManager ID="SM1" runat="server"&gt;&lt;/asp:ScriptManager&gt; &lt;ajaxToolkit:ReorderList ID="RList" runat="server" DragHandleAlignment="Left" ItemInsertLocation="End" AllowReorder="true" ShowInsertItem="true" PostBackOnReorder="false"&gt; &lt;ItemTemplate&gt; &lt;p&gt;&lt;%# Eval("ID") %&gt; = &lt;%# Eval("Name") %&gt;&lt;/p&gt; &lt;/ItemTemplate&gt; &lt;/ajaxToolkit:ReorderList&gt; &lt;asp:Button ID="ButtonAdd" runat="server" OnClick="ButtonClick_AddItem" Text="Add New" /&gt; </code></pre> <p>Then in codebehind:</p> <pre><code>public partial class SortList : System.Web.UI.Page { [Serializable] public class MyItem { public Guid Id { get; set; } public string Name { get; set; } public MyItem(Guid id, string name) { Id = id; Name = name; } } protected List&lt;MyItem&gt; MyList { get { if (ViewState["myClass"] == null) ViewState["myClass"] = new List&lt;MyItem&gt;(); return (List&lt;MyItem&gt;)ViewState["myClass"]; } } protected void AddItem(Guid id, string name) { MyList.Add(new MyItem(id, name)); RList.DataSource = MyList; RList.DataBind(); } protected void ButtonClick_AddItem(object sender, EventArgs e) { AddItem(Guid.NewGuid(), DateTime.Now.Ticks.ToString()); } } </code></pre> <p>Obviously you would substitute MyItem class with whatever you want to store and replace the button with the GridView select item event. But hopefully the principle is there?</p>
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    1. COthanks! I've been reading up on viewstate, which I haven't had to deal with yet, but this looks like it should do what I'm wanting.
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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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