.ascx file repeater link button not working

<asp:Repeater ID="rptrCategory" DataSourceID="dsCollections" runat="server" >
   <ItemTemplate>
           <asp:HiddenField ID="hfId" value='<%# Eval("Id") %>' runat="server" />
    <li id="l1" runat="server"  class='<%#Eval("CategName") %>'><span class="folder"><%# Eval("CategName") %></span>
     <ul >
   <asp:Repeater id="rptrTypes" DataSourceID="dsTypes" runat="server" OnItemCommand="rptrCategory_ItemCommand">
 <ItemTemplate>
     <li id="current">

         <asp:LinkButton ID="LinkButton1" runat="server" style="color:#000; text-decoration:none;"
CommandName="Lnkks" CommandArgument='<%#Eval("CategName") +";"+ Eval("SubCategName")%>' ><%# Eval("SubCategName")%></asp:LinkButton>

   </span>
     </li>
     </ItemTemplate>
      </asp:Repeater>
      </ul>
      </li>
      <asp:SqlDataSource ID="dsTypes" runat="server" ConnectionString="<%$ ConnectionStrings:csConnectionString %>"
       SelectCommand="SELECT SubCategory.SubCategName,Category.CategName, SubCategory.Id, SubCategory.CategId FROM Category INNER JOIN SubCategory ON Category.Id = SubCategory.CategId where Category.Id= @categ">
       <SelectParameters>
       <asp:ControlParameter Name="categ" ControlID="hfId" PropertyName="Value" />
        </SelectParameters>
       </asp:SqlDataSource>
       </ItemTemplate>
       </asp:Repeater>
       <asp:SqlDataSource ID="dsCollections" runat="server" ConnectionString="<%$ ConnectionStrings:csConnectionString %>"
        SelectCommand="SELECT [CategName], [Id] FROM [Category]"></asp:SqlDataSource>

protected void rptrCategory_ItemCommand(object source, RepeaterCommandEventArgs e)
  {
      if (e.CommandName == "Lnkks")
      {
          Response.Write("work");
      }
  }