<form id="form1" runat="server">
        <div>
            Explicit local resource:
            <asp:Label ID="ExplicitLocalResourceLabel" runat="server" Text="<%$ Resources:ExplicitLabelResource %>"></asp:Label>
            <br />
            Implicit local resource:
            <asp:Label ID="ImplicitLocalResourceLabel" runat="server" meta:resourceKey="ImplicitLabelResource1"></asp:Label><br />
            Explicit global resource:
            <asp:Label ID="ExplicitGlobalResourceLabel" runat="server" Text="<%$ Resources:MyGlobalStrings, GlobalResourceString %>"></asp:Label><br />
            Code-based resource:
            <asp:Label ID="CodeBasedResourceLabel" runat="server"></asp:Label>
        </div>
    </form>

why not just use DNN localization?

Adhering to standards will make it easier to work together with other people

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Actually, I'm trying to make a pop-up in dnn which has to access a resource file (resx) to look up some label value's.

The problem is, I can't get it to work.
I'm using stuff like:
PopUp.aspx
<asp:label runat="server" ID="lblSomeLabel" meta:resourceKey="lblSomeLabel">></asp:label>

/LocalResources/PopUp.aspx.resx
with an entry for lblSomeLabel

Could it be DNN that is blocking this?