Whole Page Refreshing

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C#

ASP.NET

Here I am Using asp:Update Panel for Repeater Control but it is not working. My Code is
asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Panel ID="pnlDgJobDetailsFound" runat="server" ScrollBars="Auto" Visible="false">
<asp:Repeater ID="Repeater1" runat="server" OnItemCommand="Repeater1_ItemCommand">
<HeaderTemplate>
<table border="0" align="center" valign="top" cellpadding="3" cellspacing="1">
</HeaderTemplate>
<ItemTemplate>
<tr>
<td bgcolor="#ffffff" align="center" valign="top">
<table>
<tr>
<td align="left" width="320">
<a href='<%# DataBinder.Eval(Container.DataItem, "ENGID", "moreengagements.aspx?id={0}") %>'>

<b>
<%# DataBinder.Eval(Container.DataItem, "ENGTITLE") %>
</b></a>
</td>
<td align="right" width="300">
<
<%# Convert.ToDateTime(DataBinder.Eval(Container.DataItem, "PublishingDate")).ToLongDateString() %>
</td>
</tr>
<tr>
<td bgcolor="#ffffff" align="left">
<%# DataBinder.Eval(Container.DataItem, "header") %>
. . .
</td>
</tr>
</table>
</td>
</tr>
</ItemTemplate>
<FooterTemplate>
</table>
</FooterTemplate>
</asp:Repeater>
<br />
</asp:Panel>
</ContentTemplate>
</asp:UpdatePanel>
The Problem i am facing is when i am clicking on href it will navigate to another page so the page is getting postback. but is there any alternative that my page should navigate but it should not be refreshed.