RadComboBox - AutoComplete

[Bader]

Hello,

I'm using the following autocomplete radcombobxo:

<telerik:RadComboBox
                                 ID="ParentRadComboBox" runat="server"
                                 Width="590px" Height="140px" AllowCustomText="true" MarkFirstMatch="true"
                                 EmptyMessage="Type a Title" DataValueField="SerID"
                                 DataSourceID="GuideSqlDataSource" DataTextField="Title" >
                             <CollapseAnimation Type="OutQuint" Duration="200"></CollapseAnimation>
                        </telerik:RadComboBox>

The problem is the user can type a text which is not even exist within the radcombobox item and click Submit (A Button).
I need to use the property AllowCustomText .
How can I validate that the typed text is valid?

Please, I need your help,
It is appreciated to sendme the modified code.

Regards,
Bader

[Shinu]

Hello Bader,

You can try the same approach in the following code library to achieve your scenario.
Various RadComboBox implementations with Required Field Validation .

Thanks,
Shinu.