<asp:SqlDataSource ID="ds" runat="server" SelectCommand="SELECT EmployeeID, LastName, FirstName, Region FROM Employees WHERE (City=@City)" ConnectionString="Server=localhost;Database=Northwind;Trusted_Connection=true">
<SelectParameters>
<asp:ControlParameterControlID="DropDownList1" Name="City" PropertyName="SelectedValue" Type="String" />
</SelectParameters>
</asp:SqlDataSource>
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