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asp.net listbox validation pass without a value selected

Manoj Bhatt 1774 18-Dec-2013

I have a listbox with Data coming from a database. But the validation passes even when value is not selected. I have tried ,just simple required field validator and does not work either. Here is the code.

<asp:Panel ID="panelDelivery" runat="server"  Visible="false"
               style="position: relative; top: -130px; background-color: #66FF33; left: 0px;"  >
           <asp:Label ID="lblOverWeight" runat="server" Width="344px"></asp:Label><br />
           <asp:ListBox ID="listBxDelivery" runat="server" DataSourceID="Delivery"
               DataTextField="DataText" DataValueField="Price" Width="489px"        
               AppendDataBoundItems="True" CausesValidation="True" AutoPostBack="True"
                   style="top: 0px; left: 0px">
           </asp:ListBox>
<asp:RequiredFieldValidator ID="rfvDelivery" runat="server"
                   ErrorMessage="* Select Delivery " ControlToValidate="listBxDelivery"></asp:RequiredFieldValidator>

c# c# 
Updated on 18-Dec-2013

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