Model Validation
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Both model binding and model validation occur before the execution of a controller action or a Razor Pages handler method.
For web apps, it's the app's responsibility to inspect ModelState.IsValid and react appropriately. ModelState represents errors that come from two subsystems: model binding and model validation.
Errors that originate from are generally data conversion errors. For example, an "x" is entered in an integer field.
Model validation occurs after model binding and reports errors where data doesn't conform to business rules. For example, a 0 is entered in a field that expects a rating between 1 and 5.
: Indicates that a property or parameter should be excluded from validation.
: Validates that the property has a credit card format. Requires .
: Validates that two properties in a model match.
: Validates that the property has an email format.
: Validates that the property has a telephone number format.
: Validates that the property value falls within a specified range.
: Validates that the property value matches a specified regular expression.
: Validates that the field isn't null. See for details about this attribute's behavior.
: Validates that a string property value doesn't exceed a specified length limit.
: Validates that the property has a URL format.
: Validates input on the client by calling an action method on the server. See for details about this attribute's behavior.