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    <p>You will have to add some custom Javascript to your page for the client-side alert to show. Here's a method that I've written that works with a GridView called 'GridView1' (this should be the default name if you've just dragged the control onto your ASPX page):</p> <pre><code>&lt;script type="text/javascript"&gt; function ClientCheck() { var valid = false; var gv = document.getElementById("GridView1"); for (var i = 0; i &lt; gv.all.length; i++) { var node = gv.all[i]; if (node != null &amp;&amp; node.type == "checkbox" &amp;&amp; node.checked) { valid = true; break; } } if (!valid) { alert("Invalid. Please select a checkbox to continue."); } return valid; } &lt;/script&gt; </code></pre> <p>You can see that it sets a variable to the <code>GridView</code> control to start with, then iterates through all the children in a <code>for</code> loop. If the child is a <code>checkbox</code> and it is <code>checked</code>, then we set the <code>valid</code> variable to true. If we get to the end of the iteration and no checked checkboxes are found, then <code>valid</code> remains false and we execute the alert.</p> <p>To link this into your <code>GridView</code> on your ASPX page, first make the button column a <code>TemplateField</code> and surround the <code>LinkButton</code> with your client-side code. If you've used the designer to set up your columns, you can use the "Convert this field into a TemplateField" link in the column editor). Here's an example of the source you'll end up with:</p> <pre><code>&lt;asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataSourceID="ObjectDataSource1"&gt; &lt;Columns&gt; &lt;asp:TemplateField HeaderText="Button Field" ShowHeader="False"&gt; &lt;ItemTemplate&gt; &lt;span onclick="return ClientCheck();"&gt; &lt;asp:LinkButton ID="LinkButton1" runat="server" CommandName="IDClick" Text='&lt;%# Eval("YourDataSourceItem") %&gt;'&gt;&lt;/asp:LinkButton&gt; &lt;/span&gt; &lt;/ItemTemplate&gt; &lt;/asp:TemplateField&gt; // ...your remaining columns... </code></pre> <p>Using the <code>TemplateField</code> lets us add any client-side code we like. Here we're adding a <code>span</code> and using <code>onclick</code> to call our <code>ClientCheck</code> method.</p> <p>If you aren't bothered about the alert, you could achieve your aims by using a <code>CustomValidator</code> control, which executes on the server-side.</p> <p>I hope this helps.</p>
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