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I have a problem to add required field validator for listbox.
when I fill the listbox with the values and submit the record it works perfectly. before submiting the record it checks for the required field in the listbox.
But after submitting the record if I try to submit another record even if the listbox has the values it again ask the required field.

<td width="40%" align="center">
                                    <asp:ListBox ID="lstSelectedStudents" runat="server" Width="150px" Height="120" SelectionMode="Multiple"></asp:ListBox>
                                <td align="center" width="10%">
                                    <%--<asp:RequiredFieldValidator ID="Rfv_lstSelectedStudents" runat="server" ControlToValidate="lstSelectedStudents" ErrorMessage="Select student list" Text="*" ValidationGroup="Vg_Activity" ForeColor="Red" Display="Dynamic"></asp:RequiredFieldValidator>--%>

Please help...
Posted 11-Jul-13 2:55am
Updated 11-Jul-13 2:59am
yloginov 11-Jul-13 10:08am
do you change the selected value in the list box when you do a second submit or do you keep the same value that was selected on the first submit?

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