<asp:DetailsView ID="dvUser" runat="server" AutoGenerateRows="False" Caption="Добавление нового пользователя" 
DataSourceID="dsUsers" Height="50px" Width="445px" BorderStyle="Solid" CaptionAlign="Left" DefaultMode="Insert">
            <Fields>
                <asp:BoundField DataField="code" HeaderText="Логин" SortExpression="code" />
                <asp:BoundField DataField="name" HeaderText="Имя" SortExpression="name" />
                <asp:CheckBoxField DataField="isworker" HeaderText="Сотрудник Парус ?" SortExpression="isworker" />

//-- вот это поле

                <asp:TemplateField HeaderText="Организация пользователя" SortExpression="org_id">
                    <InsertItemTemplate>
                        <asp:DropDownList ID="dlOrgs" runat="server" DataField="org_id" DataMember="DefaultView" 
DataSourceID="dsOrgs" DataTextField="code" DataValueField="id"></asp:DropDownList>
                    </InsertItemTemplate>
                    <ControlStyle Width="200px" />
                </asp:TemplateField>



                <asp:BoundField DataField="password" HeaderText="Пароль" SortExpression="password" />
                <asp:CheckBoxField DataField="isadmin" HeaderText="Администратор ?" SortExpression="isadmin" />
                <asp:CheckBoxField DataField="isblocked" HeaderText="Заблокирован ?" SortExpression="isblocked" />
                <asp:CommandField ShowInsertButton="True" />
            </Fields>
        </asp:DetailsView>