Select or Deselect all by checkbox in Gridview

By JQuery

<script type="text/javascript">
$(document).ready(function() {

var headerCheckbox = $('#GridView1 > tbody > tr > th > input:checkbox');

headerCheckbox.click(function() {
var headerChecked = $(this).attr('checked');
var rowCheckboxes = $('#GridView1 > tbody > tr > td > input:checkbox');
rowCheckboxes.attr('checked', headerChecked);
});

});
</script>
Go to complete example


By classic javascript 

<script type="text/javascript">
function CheckAllRow(chkBox) {
var gridViewCtlId = '<%=GridView1.ClientID%>';
var grid = document.getElementById(gridViewCtlId);
var gridLength = grid.rows.length;
for (var i = 1; i < gridLength; i++) {
cell = grid.rows[i].cells[1];
for (var j = 0; j < cell.childNodes.length; j++) {
if (cell.childNodes[j].type == 'checkbox') {
cell.childNodes[j].checked = chkBox;
}
}
}
}
</script>
Go to complete example