Hi Jawed,
Thank you for using Syncfusion products.
The reported issue with ‘Validation is not working with Server
mode Dialog editing' has been confirmed as a defect; hence we have logged a
defect report. However, we do not provide confidential information and patches
in the general forum, so could you please create a new incident such that we
can fix the issue and provide the patch for you.
Please let us know if you need any further assistance.
Regards,
Eswari.S