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Editorial Team
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Asked: 2026-05-26T02:35:35+00:00

Scenario: I have the following controls: <telerik:RadComboBox ID=dd1 runat=server ValidationGroup=g1 InitialValue=-1 /> <telerik:RadComboBox ID=dd2

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Scenario:

I have the following controls:

<telerik:RadComboBox ID="dd1" runat="server" ValidationGroup="g1" InitialValue="-1" />
<telerik:RadComboBox ID="dd2" runat="server" ValidationGroup="g1" InitialValue="-1" />
<asp:CompareValidator ID="cv" runat="server" ValidationGroup="g1" InitialValue="-1"
                    ControlToValidate="dd1" ControlToCompare="dd2" Operator="NotEqual" Text="error"
                    Type="String" />

I don’t want the 2 dropDowns to have the same values, excluding “-1” which is the default value of any dropdown.

Can I achieve this using the compareValidator? or should i use javascript?

thanks in advance

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1 Answer

  1. Editorial Team

    For comparision, compare validator is correct. But for initial value (-1), you need to add required field validators for both dropdowns. So user must select value.

    <telerik:RadComboBox ID="dd1" runat="server" ValidationGroup="g1" InitialValue="-1" /> 
<asp:RequiredFieldValidator ID="reqv1" runat="server" ErrorMessage="Please select value" ControlToValidate="dd1" ValidationGroup="g1" InitialValue="-1"></asp:RequiredFieldValidator>
<telerik:RadComboBox ID="dd2" runat="server" ValidationGroup="g1" InitialValue="-1" /> 
<asp:RequiredFieldValidator ID="reqv2" runat="server" ErrorMessage="Please select value" ControlToValidate="dd2" ValidationGroup="g1" InitialValue="-1"></asp:RequiredFieldValidator>
<asp:CompareValidator ID="cv" runat="server" ValidationGroup="g1" InitialValue="-1" 
                    ControlToValidate="dd1" ControlToCompare="dd2" Operator="NotEqual" Text="error" 
                    Type="String" />
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