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<asp:EntityDataSource ID="targert" runat="server" ConnectionString="name=portalEntities1"
            DefaultContainerName="portalEntities1" EnableFlattening="False" 
            CommandText="SELECT first_table.id FROM first_table 
        WHERE ANYELEMENT(select second_table.field_2 from first_table.second_table where second_table.field_2 = @var1).field_2 = @var1
        " EntityTypeFilter="">
            <CommandParameters>
                <asp:QueryStringParameter Name="var1" QueryStringField="var1" DbType="String" />
            </CommandParameters>
        </asp:EntityDataSource>
                                    
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