asp:placeholder - koden er i en code-behind fil (vb)

dim mode as string = request.querystring("mode")
dim indhold as placeholder
Select case mode
       
Case "admin"
    indhold = loadControl("ascx/admin.ascx")
    placeholder.controls.add(indhold)
Case else
    indhold = loadControl("ascx/main.ascx")
    placeholder.controls.add(indhold)
end select

dette er fejlen:

Compiler Error Message: BC30469: Reference to a non-shared member requires an object reference.

der peger på denne linje:

placeholder.controls.add(indhold)


hjælp.. :)