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<asp:sqlDataSource ID="sdsCustomersByCountry" runat="server"
  SelectCommand="GetCustomersByCountry"
  SelectCommandType="StoredProcedure">
  
    <SelectParameters>
        <asp:ControlParameter ControlID="ddCountries"
          Name="Country" PropertyName="SelectedValue"
          Type="String" />                     <%-- assign parameter data from DropDownList value --%>
    </SelectParameters>
</asp:SqlDataSource>

<asp:DataList id="dlCusts" DataSourceId="sqlCustomers" runat="server">
  <ItemTemplate>
    <%# Eval("ContactName") %>
  </ItemTemplate>
</asp:DataList>