check for duplicated values to display on repeater

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C#

<asp:Repeater ID="Repeater1" runat="server"
            >

    <HeaderTemplate>

          </HeaderTemplate>

        <ItemTemplate>

       <asp:CheckBox ID="Chkquey" runat="server"></asp:CheckBox>
        <span style="color:#666">Searched for&nbsp;</span><span>
  <asp:LinkButton   ID="link" runat="server"  Text='<%#DataBinder.Eval(Container.DataItem, "query")%>'></asp:LinkButton><br />


  &nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp<asp:CheckBox ID="Chklinks" runat="server"></asp:CheckBox>
     <asp:LinkButton   ID="link2" runat="server" PostBackUrl='<%#DataBinder.Eval(Container.DataItem, " urllink")%>' Text='<%#DataBinder.Eval(Container.DataItem, "linkss")%>'></asp:LinkButton><br />
</ItemTemplate>

         </asp:Repeater>

design

Searched for Databound
        Databound

Searched for  Databound
        Databound
Searched for  Databound
        Databound
Searched for  Databound
        Databound
Searched for  Databound
        Databound




i want to check for repeated query coming from my database and display those links under the query which has been duplicated