Listview Linkbutton disable by VB

Hi,
I got a list view table with LinkButton in the cells like:

<asp:ListView ID="Usr_Packages" Runat="Server" DataKeyNames="Package" DataSourceID="Usr_Pkg_Src" EnablePersistedSelection="false" ><LayoutTemplate><table  class="ListviewTable" border="1" contenteditable="false" style="width: 590px;"><tr> <th style="font-family: Arial; font-size:14px; font-weight: bold; width:50px">Zn</th><th style="font-family: Arial; font-size:14px; font-weight: bold; width:150px">Rgn</th><th style="font-family: Arial; font-size:14px; font-weight: bold; width:150px">Mkt</th><th style="font-family: Arial; font-size:14px; font-weight: bold; width:150px">Pkg</th></tr><tr id="itemPlaceholder" runat="server" /></table></LayoutTemplate><ItemTemplate ><tr><td><asp:LinkButton ID="Btn_Zn_Rvw" runat="server" Font-Size="14px" Text='<%#Eval("Zn")%>' onclick="Btn_Zn_Rvw_Click" PostBackUrl='<%#"~/Membersites/Cpx_Review_09_Zn_01.aspx?Zn=" + Eval("Zn")%>'></asp:LinkButton></td><td><asp:LinkButton ID="Btn_Rgn_Rvw" runat="server" Font-Size="14px" Text='<%#Eval("Rgn")%>' onclick="Btn_Rgn_Rvw_Click" PostBackUrl='<%#"~/Membersites/Cpx_Review_09_Rgn_01.aspx?Rgn=" + Eval("Rgn")%>'></asp:LinkButton></td><td><asp:LinkButton ID="Btn_Mkt_Rvw" runat="server" Font-Size="14px" Text='<%#Eval("Mrkt")%>' onclick="Btn_Mkt_Rvw_Click" PostBackUrl='<%#"~/Membersites/Cpx_Review_09_Mkt_01.aspx?Mkt=" + Eval("Mrkt")%>'></asp:LinkButton></td><td><asp:LinkButton ID="Btn_Pkg_Inpt" runat="server" Font-Size="14px" Text='<%#Eval("Pckg")%>' onclick="Btn_Pkg_Inpt_Click" PostBackUrl='<%#"~/Membersites/Cpx_Page_02_Inpt.aspx?Pkg=" + Eval("Pkg")%>'></asp:LinkButton></td></tr></ItemTemplate></asp:ListView> 

Depending on certain conditions I want to enable or disable those linkbuttons at column level (not on row level).
I tried a lot but ...

Any hint appreciated
regards
lucio