I'm still plugging away on my asp.net app-- and I am trying to build a simple query that will grab some data based on the input from a drop down.

However, the parameter never gets set-- and I get SQL Server errors, since the query is invalid without the parameters being set.

Error:

Each GROUP BY expression must contain at least one column that is not an outer reference. 

Here's my query and the param that never gets set-- I figured that if I set a default value it ought to work whether or not the dropdown control is working, right?

<asp:SqlDataSource ID="root" runat="server" 
    ConnectionString="<%$ ConnectionStrings:Stats_DevConnectionString %>" 
    SelectCommand="SELECT @view_type,COUNT([UniqueVisitors]) as u_visitors,
      COUNT([Visits]) as visits,
      COUNT([PageViews]) as pageviews 
      FROM [Report_WebPagesByProperty]
      GROUP BY @view_type">
      <SelectParameters>
        <asp:ControlParameter Name="view_type" ControlID="DropDownList1" Type="String" PropertyName="SelectedValue" DefaultValue="Root" />
      </SelectParameters>
  </asp:SqlDataSource>

Thanks for any clues.