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El método CustomValidationAttribute '<var>Method name</var>' en el tipo '<var>Type Name</var>' debe devolver System.ComponentModel.DataAnnotations.ValidationResult. Use System.ComponentModel.DataAnnotations.ValidationResult.Success para representar un resultado correcto.
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The CustomValidationAttribute method '<var>Method name</var>' in type '<var>Type Name</var>' must return System.ComponentModel.DataAnnotations.ValidationResult. Use System.ComponentModel.DataAnnotations.ValidationResult.Success to represent success.
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