DotNet - Briefly explain how the server control validation controls work.

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Briefly explain how the server control validation controls work.

Total Answers and Comments: 2

Last Update: January 16, 2006

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July 21, 2005 05:12:02

Takrim Khan

RE: Briefly explain how the server control validation controls work.

A validation control works by evaluating the value of an input server control on the page to see whether it meets certain criteria. The input control to evaluate is specified through the validation control s ControlToValidate attribute. You can programmatically cause a validation control to perform its evaluation by calling its Validate method which sets the validation control s IsValid property to true if validation succeeds and false if it fails. You can cause all of the validation controls on a page to validate their input controls by calling the Page.Validate method.

The Page.IsValid property is set to true if validation succeeds for all validation controls within the page; otherwise it's false. The Page.Validate method is automatically invoked when a button control whose CausesValidation property is set to true is clicked. CausesValidation is set to false by default for a reset or clear button. The button click event is suppressed if IsValid is false for any validation control on the page

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January 16, 2006 06:17:58

samiksc

Member Since: October 2005 Contribution: 233

RE: Briefly explain how the server control validation ...

There are following types of validation controls provided by ASP.Net:

RequiredFieldValidator
CompareValidator
RangeValidator
RegularExpressionValidator
CustomValidator

These controls are server side controls. However in up-level browsers that is IE 4.0 and above these can be enabled on client side also.

All these controls have a property called ControlToValidate.

RequiredFieldValidator ensures data entry into the ControlToValidate.

CompareValidator uses ControlToValidate ControlToCompare and operator properties to compare a control's value with another control's value. It also has a property 'ValueToCompare' for comparing ControlToValidate against a constant value.

RangeValidator uses ControlToValidate MaximumValue and MinimumValue to compare a controls value against a range.

RegularExpressionValidator uses ControlToValidate and ValidationExpression properties.

CustomValidator performs its task by using ClientValidationFunction and OnServerValidate delegate.

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