Required field validation on production server issue

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C#2.0

C#

ASP.NET

Hi all,

I have a STRANGE issue that drive me crazy.

I have a page where i load a usercontrol when i click a button.
In this usercontrol i have a textbox and a button plus a required field validator for this textbox and linked to a validation summary.

On my local computer, the validation works fine, but when i deploy this usercontrol on production server the validation don't work, knowing that i have a similar control for another page where the validation works fine on production.

Does anyone has any idea about this issue.

Thank you all for your help