RequiredFieldValidator.NET 1.1, disposable

System.Web.UI.MobileControls (

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. In this way, the RequiredFieldValidator control works identically to the System.Web.UI.WebControls.RequiredFieldValidator control for full-fledged web pages (although it won't render client-side validation code).

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 BaseValidator CreateWebValidator( );        // overrides BaseValidator
   protected override bool EvaluateIsValid( );       // overrides BaseValidator


System.Object System.Web.UI.Control(System.ComponentModel.IComponent, System.IDisposable, System.Web.UI.IParserAccessor, System.Web.UI.IDataBindingsAccessor) MobileControl(System.Web.UI.IAttributeAccessor) TextControl BaseValidator(System.Web.UI.IValidator) RequiredFieldValidator

    Part I: Introduction to ASP.NET
    Part III: Namespace Reference
    Chapter 40. The System.Web.UI.MobileControls Namespace
    Chapter 42. The System.Web.UI.WebControls Namespace