One workaround could be :
invoke dummyButton click in client side event of anchor tag - which
will call server side event of this dummy Button by default. so if u
place ur server side code in this dummyButton server event - calling
anchor tag client side event would invoke this server
side dummy button event.
Code:
<a id="ancLink" href="javascript:void(0);" >back</a>
<asp:Button ID="dummyRefresh" runat="server" OnClick="BtnRefreshOnclick" style="display:none"/>
Javascript:
ancLink.live("click", function () {
callDummyButtonServerEvent();
});
function callDummyButtonServerEvent() {
$('input[id$=dummyRefresh]').click();
}
Hope this helps.