Updatepanel with gridview error in AsyncPostBackTrigger with EventName

Question

Hi

I have gridview in which i have taken a linkbutton ,my requirement is to ,when user clicks on the linkbutton that name should display on a label ,
i'm getting a error like the following

Could not find an event named 'lnkEmailId_OnClick' on associated control 'gridviewUsers' for the trigger in UpdatePanel 'UpdatePanel1'.

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="gridviewUsers" EventName="lnkEmailId_OnClick" />
</Triggers>
<ContentTemplate>
<asp:GridView ID="gridviewUsers" runat="server" AutoGenerateColumns="false" OnRowCommand="gridviewUsers_RowCommand">
<Columns>
<asp:TemplateField HeaderText="USer Name">
<ItemTemplate>
<asp:Label ID="lblUserName" Text='<%#Bind("Name") %>' runat="server"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="EMAIL ID">
<ItemTemplate>
<asp:LinkButton ID="lnkEmailId" runat="server" Text='<%#Bind("EmailID") %>' OnClick="lnkEmailId_OnClick"
CommandName="Clicked" CommandArgument='<%#Bind("EmailID") %>'>
</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</ContentTemplate>
</asp:UpdatePanel>


if i use <asp:PostBackTrigger ControlID="gridviewUsers" />
it is working fine but a postback is happening
Pleas help me out ,how can i do with <asp:AsyncPostBackTrigger />