How to use ASP.NET validator control with example

ASP.NET validator are controls used for validating the data entered in an input control , such as the textbox of a Web page.When a user enters invalid data in an associated control, the ASP.NET validator  control displays an error message on the screen. The error message is defined as a property value of the validation control . The data being entered is validated each time it is entered by the user , and the error message disappears only when the data is valid. Validation controls help save time and enhance the efficiency of the application by validating the data before a request is sent to the server.
The BaseValidator class
The System.Web.UI.WebControls.BaseValidator class provides basic implementation required for all validation controls.

Public Properties of the BaseValidator Class

ControlToValidate : Handles an input control, such as the TextBox Control , which needs to be validated.

Display : Handles the behavior of the error message in a validation control.

EnableClientScript : Handles a value indicating whether or not client-side validation is enabled

Enabled : Handles a value that indicates whether or not the validation control is enabled or not.

ErrorMessage : Handles the text for the error message displayed in a ValidationSummary control when validation fails.

ForeColor : Handles the color of the messgage displayed when validation fails.

IsValid : Handles a value that indicates if the focus is set on the control or not , specified by the ControlToValidate property when validation fails.

Text : Handles the text displayed in the validation control when the validation fails.

ValidationGroup : Handles the name of the validation group to which this validation control belongs.

Note: ValidationGroup property , when set, validates only the validation controls within the specified group when the control is posted back to the server.

Public Methods of the BaseValidator Class

validate() : Helps in performing validation on the associated input control and update the IsValid property

GetValidationProperty : Help in determining the validation property of a control , if it exists.

The following ASP.NET validator controls are


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