Occurs when validation is performed on the server.
Assembly: System.Web (in System.Web.dll)
The event is raised when validation is performed on the server. This event is used to provide a custom validation routine for an input control, such as a TextBox control.
For more information about handling events, see Events and Delegates.
|Walkthrough: Validating User Input in a Web Forms Page||Building ASP .NET Web Applications in Visual Studio|
The following code example demonstrates how to specify and code a handler for a server-side CustomValidator control. It creates a custom validation routine, validates the value of a TextBox control for an even number, and then displays the result of the validation.
This example has a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview.