When we use VS.NET to create default DNN module, there is an data list. If user logs in as admin, there are edit buttons in every items. I tried to use Visible="<%# IsEditable %>" for asp.net LinkButton. However, the linkbutton still appears when user is a guest. Here is the code:

<asp:LinkButton runat="server" ID="lbtnManageLinks" OnClick="lbtnManageLinks_Click" Visible="<%# IsEditable %>">Site Link Management</asp:LinkButton>

Please tell me how to fix it. This problem is strange.

Well, <%= %> tags in ASP.NET are data binding tags. So, anything put in between them wont execute till BindData() is called on the corresponding control.

In your case, put the following statement in your control's Load event:

lbtnManageLinks.DataBind()

If you monitor carefully, DataBind() has been called on that DataList. If you remove that, IsEditable wont work even for that List!!!