Requiredfieldvalidator in Dropdown

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Hi,
I have a DropDownList and a RequiredFieldValidator that checks if a
value has been selected for the DropDownList by the user.

I am populating the drop down at runtime and adding two items, ( "Please select" and "All").

The "Please select" option has a value of "".

The problem I am facing is that when I select the "Please select"
option the error message of the RequiredFieldValidator gets displayed
for a second or so and then the page posts back.

I wanted that the error message should be displayed and the page should not post back.

Am I doing something wrong here?

I could check the value of the selected item at the server side but that is just a waste of one round trip. The AutoPostBack property of the DropDownList is set to true.

Any help would be appreciated .

Thanks in advance.

Posted 29-Oct-10 21:06pm

mohini1796

Updated 29-Oct-10 21:32pm

saini arun

v2

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saini arun 30-Oct-10 3:33am

Minor formatting changes.

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shakil0304003 · Answer 1 · 2010-10-29T21:28:00

You can use compare validator.
Example:

XML

<asp:CompareValidator
                          id="cvNumberOfGuests"
                          runat="server"
                          ControlToValidate="ddlNumberOfGuests"
                          ErrorMessage="You must select the number of guests (1-5)."
                          ValueToCompare="0"
                          display="Dynamic"
                          Type="Integer"
                          Operator="GreaterThan">*</asp:CompareValidator>
                <asp:DropDownList ID="ddlNumberOfGuests" Width="100%" runat="server">
                    <asp:ListItem Value="0" Selected="true">Number of guests</asp:ListItem>
                    <asp:ListItem Value="1">1</asp:ListItem>
                    <asp:ListItem Value="2">2</asp:ListItem>
                    <asp:ListItem Value="3">3</asp:ListItem>
                    <asp:ListItem Value="4">4</asp:ListItem>
                    <asp:ListItem Value="5">5</asp:ListItem>
                    <asp:ListItem Value="6">Contact us for more than 5 guest</asp:ListItem>
                </asp:DropDownList>

Hiren solanki · Answer 2 · 2010-10-29T21:24:00

suppose you are having this items in your dropdownlist..

DropDownList1.Items.Add(new ListItem("--Select--","0"));
DropDownList1.Items.Add(new ListItem("Hiren","1"));
DropDownList1.Items.Add(new ListItem("Mohini","2"));
DropDownList1.Items.Add(new ListItem("Chris", "3"));

then.. set the requiredfieldvalidator's controltovalidate property to "DropDownlist1" and set the "InitialValue" property of the requiredfieldvalidator to "0" as this will be the value for "--Select--" you can show above..

hope it helps.
please let us know if you are having some another doubt than this one..

Requiredfieldvalidator in Dropdown

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