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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.

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    I think people editor has setting is itself to allow multiple users. If its set for just one user then by itself it will prompt user with a message. – Asad Refai Feb 5 at 8:57
  • You could achieve this using Client Side Rendering. But if you really just want to limit the input to one user, then like Asad said, there's already a built-in functionality for this. – LeonidasFett Feb 5 at 11:16

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