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POWhen using a GridView, SelectedIndex is always 0 when using custom select button
 

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  1. POWhen using a GridView, SelectedIndex is always 0 when using custom select button
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    <p>When clicking the select button in gvSquid2, x gets a valid and correct value. When clicking the select button in gvSquid, I get an ArgumentOutOfRange Exception because gv.<code>SelectedIndex</code>=0. Additionally, gv.<code>SelectedDataKey</code> is null. How do I get the <code>DataKey</code> information? Putting it in a column is not acceptable, as it must be hidden from the user. Hiding the column is useless, because during <code>DataBind()</code>, the value is discarded. I ripped this example from Microsoft's website. What am I missing?</p> <pre><code>&lt;asp:gridview ID="gvSquid2" DataSourceID="dsComments" AutoGenerateColumns="false" AutoGenerateSelectButton="true" DataKeyNames="ID" OnSelectedIndexChanged="gvSquid_SelectedIndexChanged" runat="server" EnableViewState="false"&gt; &lt;Columns&gt; &lt;asp:BoundField DataField="Date" ReadOnly="true" HeaderText="Date" SortExpression="Date" /&gt; &lt;asp:BoundField DataField="Comment" ReadOnly="true" HeaderText="Comment" SortExpression="Comment" /&gt; &lt;asp:BoundField DataField="Username" ReadOnly="true" HeaderText="User" SortExpression="Username" /&gt; &lt;/Columns&gt; &lt;/asp:gridview&gt; &lt;asp:gridview ID="gvSquid" DataSourceID="dsComments" AutoGenerateColumns="false" DataKeyNames="ID" OnSelectedIndexChanged="gvSquid_SelectedIndexChanged" runat="server" EnableViewState="false"&gt; &lt;Columns&gt; &lt;asp:CommandField ButtonType="Image" HeaderText="Select" ShowSelectButton="true" SelectImageUrl="~/includes/RedX.jpg" /&gt; &lt;asp:BoundField DataField="Date" ReadOnly="true" HeaderText="Date" SortExpression="Date" /&gt; &lt;asp:BoundField DataField="Comment" ReadOnly="true" HeaderText="Comment" SortExpression="Comment" /&gt; &lt;asp:BoundField DataField="Username" ReadOnly="true" HeaderText="User" SortExpression="Username" /&gt; &lt;/Columns&gt; &lt;/asp:gridview&gt; protected void gvSquid_SelectedIndexChanged(object sender, EventArgs e) { string x; x = gvSquid.DataKeys[gvSquid.SelectedIndex].Value.ToString(); } </code></pre>
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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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If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

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