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RequiredAttribute.IsValid Method (Object)

Checks that the value of the required data field is not empty.

Namespace:  System.ComponentModel.DataAnnotations
Assembly:  System.ComponentModel.DataAnnotations (in System.ComponentModel.DataAnnotations.dll)

public override bool IsValid(
	Object value
)

Parameters

value
Type: System.Object

The data field value to validate.

Return Value

Type: System.Boolean
true if validation is successful; otherwise, false.

ExceptionCondition
ValidationException

The data field value was null.

If the value is an empty string, the method returns false and a validation error is displayed.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5 SP1

.NET Framework Client Profile

Supported in: 4

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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