This new property (*not* event), allows you to wire up clientside code to be executed before the server-side onclick is handled. In the old days we had to do this manually. For example, this is how you would hook up a simple confirmation dialog:
<script language="jscript" type="text/jscript">
<!--
function deleteConfirmation(event)
{
if (!window.confirm("Are you sure?"))
{
window.event.returnValue = false;
}
}
-->
</script>
<asp:LinkButton ID="deleteButton"
runat="server"
CausesValidation="false"
CommandName="Delete"
OnClick="deleteButton_Click"
OnClientClick="deleteConfirmation()"
Text="Delete">
</asp:LinkButton> This allows you to cancel the server-side event if the user says nope! Cool!
