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Editorial Team
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Asked: 2026-05-24T22:28:25+00:00

I’m getting some error: ControlToValidate of ” cannot be empty ( ControlToValidate de ”

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I’m getting some error: ControlToValidate of ” cannot be empty (ControlToValidate de '' ne peut pas être vide in french).

Most of the time, this error occurs after the add of new controls in the page/user control, and it’s not too difficult to figure out with control is lacking ValidationGroup.

But what can you do to find out the cause of this error when it’s a legacy screen with tons of controls, with ajax and telerik components? I’m mainly looking for tips / best practices to debug such issues.

Thanks in advance.

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1 Answer

  1. Editorial Team

    This error occurs if you have a validator control on your page without filling in the control to validate property. It has nothing to do with validationgroups as far as I know.

    To answer your question, I would say a regular expression will be the ‘easiest’ way to do so.

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