User HTML Helper to populate a DropDown list

I'm trying to p开发者_Go百科opulate a dropdown list with a list returned by a query to my object's facade. I've seen a couple examples here but nothing close enough to my use case. Seems like:

<%= Html.DropDownList("User.Affiliate", UserFacade.Instance.SelectAffiliates())%>

should work but doesn't.

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Try using

<%= Html.DropDownList("User.Affiliate", 
    new SelectList(UserFacade.Instance.SelectAffiliates()))%>