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The client side validation is accomplished through the Client Validation Function property.
The client side validation routine should be written in a scripting language, such as Java Script or VBScript, which the browser can understand.
In the Validating event-handling method, you can validate user input in several ways.
For example, if you have a text box that must contain a postal code, you can perform the validation in the following ways: The Validating event is supplied an object of type Cancel Event Args.
If you want to use implicit validation for a control, you must set that control's Auto Validate property to .
This kind of situation is handled using validation groups.
To create a validation group, you should put the input controls and the validation controls into the same logical group by setting their Validation Group property.
The implicit validation approach validates data as the user enters it.
You can validate the data as the data is entered in a control by reading the keys as they are pressed, or more commonly whenever the user takes the input focus away from one control and moves to the next.