Questions tagged [validation-error]

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List update and file upload using REST API failed with a SPListDataValidationException

I use the REST API to create list item, upload file linked to this item and update the item. For some list everything works fine and I can realize all these operations but for some other lists on the ...
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Custom validation for people editor control

How to add custom validation for in asp.net if the user adds more than one username an error message must appear that he can only add one user. Thanks Regard.