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<asp:SqlDataSource ID="SqlDataSource2" runat="server"
ConnectionString="<%$ ConnectionStrings:Gwhsrv5 %>"
ProviderName="<%$ ConnectionStrings:Gwhsrv5.ProviderName %>"
SelectCommand="select floor from router_building_dict where location=@location">
<SelectParameters>
<asp:ControlParameter ControlID="DropDownList1" Name="location"
PropertyName="SelectedValue" />
</SelectParameters>
</asp:SqlDataSource>