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    copied!<p>Here is a sample I have put together for you.</p> <p><strong>ASPX</strong></p> <pre><code>&lt;head runat="server"&gt; &lt;title&gt;&lt;/title&gt; &lt;script src="Scripts/jquery-1.4.1.min.js" type="text/javascript"&gt;&lt;/script&gt; &lt;script type="text/javascript"&gt; var allCheckBoxSelector = '#&lt;%=GridView1.ClientID%&gt; input[id*="chkAll"]:checkbox'; var checkBoxSelector = '#&lt;%=GridView1.ClientID%&gt; input[id*="chkSelected"]:checkbox'; function ToggleCheckUncheckAllOptionAsNeeded() { var totalCheckboxes = $(checkBoxSelector), checkedCheckboxes = totalCheckboxes.filter(":checked"), noCheckboxesAreChecked = (checkedCheckboxes.length === 0), allCheckboxesAreChecked = (totalCheckboxes.length === checkedCheckboxes.length); $(allCheckBoxSelector).attr('checked', allCheckboxesAreChecked); } $(document).ready(function () { $(allCheckBoxSelector).live('click', function () { $(checkBoxSelector).attr('checked', $(this).is(':checked')); ToggleCheckUncheckAllOptionAsNeeded(); }); $(checkBoxSelector).live('click', ToggleCheckUncheckAllOptionAsNeeded); ToggleCheckUncheckAllOptionAsNeeded(); }); &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;form id="form1" runat="server"&gt; &lt;div&gt; &lt;asp:GridView ID="GridView1" runat="server"&gt; &lt;Columns&gt; &lt;asp:TemplateField&gt; &lt;HeaderTemplate&gt; &lt;asp:CheckBox ID="chkAll" runat="server" /&gt; &lt;/HeaderTemplate&gt; &lt;ItemTemplate&gt; &lt;asp:CheckBox ID="chkSelected" runat="server" /&gt; &lt;/ItemTemplate&gt; &lt;/asp:TemplateField&gt; &lt;/Columns&gt; &lt;/asp:GridView&gt; &lt;/div&gt; &lt;/form&gt; &lt;/body&gt; </code></pre> <p><strong>C#</strong></p> <pre><code> protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { List&lt;string&gt; lstObjects = new List&lt;string&gt; { "aaa", "bbb" }; GridView1.DataSource = lstObjects; GridView1.DataBind(); } } </code></pre> <h2>If you are using the latest version of jQuery (1.7)</h2> <p>Use the following:</p> <pre><code>&lt;script type="text/javascript"&gt; var allCheckBoxSelector = '#&lt;%=GridView1.ClientID%&gt; input[id*="chkAll"]:checkbox'; var checkBoxSelector = '#&lt;%=GridView1.ClientID%&gt; input[id*="chkSelected"]:checkbox'; function ToggleCheckUncheckAllOptionAsNeeded() { var totalCheckboxes = $(checkBoxSelector), checkedCheckboxes = totalCheckboxes.filter(":checked"), noCheckboxesAreChecked = (checkedCheckboxes.length === 0), allCheckboxesAreChecked = (totalCheckboxes.length === checkedCheckboxes.length); $(allCheckBoxSelector).attr('checked', allCheckboxesAreChecked); } $(document).ready(function () { $(allCheckBoxSelector).click(function () { $(checkBoxSelector).attr('checked', $(this).is(':checked')); ToggleCheckUncheckAllOptionAsNeeded(); }); $(checkBoxSelector).click(ToggleCheckUncheckAllOptionAsNeeded); ToggleCheckUncheckAllOptionAsNeeded(); }); &lt;/script&gt; </code></pre>
 

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