Question

I use ASP.NET and have a Button and a CustomValidator, which has to validate
the button.

<asp:Button ID="saveButton" runat="server" OnClick="SaveButton_Click" Text="Speichern"
    CausesValidation="true"/>
<asp:CustomValidator runat="server" ID="saveCValidator" Display="Static"
    OnServerValidate="EditPriceCValidator_ServerValidate"   
    ControlToValidate="saveButton" ErrorMessage="">

When loading the page, I receive the error message:

“Control ‘saveButton’ referenced by
the ControlToValidate property of
‘saveCValidator’ cannot be validated.”

What might be the problem? I searched on the net, but this didn´t help much.

Answer 1

You can only use a CustomValidator against Input controls that accept user input:

Client-side validation enhances the
validation process by checking user
input before it is sent to the server.

What you want to do is look here at Button Controls and Validation.