<asp:Repeater ID="Repeater1" runat="server" onitemcommand="Repeater1_ItemCommand" >
  <ItemTemplate>
     <asp:LinkButton ID="LB" runat="server"  CommandArgument='<%# Eval("ID")%>' CommandName="test">點選</asp:LinkButton>
  </ItemTemplate>
</asp:Repeater>

protected void AllArticle_ItemCommand(object source, RepeaterCommandEventArgs e)
{
   if (e.CommandName == "test")
   {
       DialogBox("ok!");
   }
 }