RequiredFieldValidator | disposable |
System.Web.UI.WebControls (system.web.dll) | class |
This class represents a validation control that is used to force user
entry in a corresponding input control, like a
TextBox. Validation fails if the value in the
input control does not differ from the
InitialValue property. By default,
InitialValue is set to
System.String.Empty and validation will succeed as
long as some information has been added to the input control. You can use a combination of different validation controls for a
single control. For example, you could use a
RequiredFieldValidator to ensure that a value is
entered and a RangeValidator to ensure that the
value is within a specified data range. This is often required, as
validators like RangeValidator will automatically
validate a control if it is empty, regardless of the properties you
have set. public class RequiredFieldValidator : BaseValidator {
// Public Constructors
public RequiredFieldValidator( );
// Public Instance Properties
public string InitialValue{set; get; }
// Protected Instance Methods
protected override void AddAttributesToRender(System.Web.UI.HtmlTextWriter writer);// overrides BaseValidator
protected override bool EvaluateIsValid( ); // overrides BaseValidator
}
Hierarchy
System.Object
System.Web.UI.Control(System.ComponentModel.IComponent,
System.IDisposable,
System.Web.UI.IParserAccessor,
System.Web.UI.IDataBindingsAccessor)
WebControl(System.Web.UI.IAttributeAccessor)
Label
BaseValidator(System.Web.UI.IValidator)
RequiredFieldValidator
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