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These pairs let you define rules for both conditions: an error condition and a "normal" (non-error) condition.It's important to understand that the markup for the error display is always rendered, even if there are no errors.Therefore, you also have to make sure that the values that users enter can be correctly converted to the appropriate data types.
For example, suppose you specify that a value should be an integer.
Server side validation is performed by a web server, after input has been sent to the server.
Client side validation is performed by a web browser, before input is sent to a web server.
This article discusses how to validate information you get from users — that is, to make sure that users enter valid information in HTML forms in an ASP. What you'll learn: If you ask users to enter information in a page — for example, into a form — it's important to make sure that the values that they enter are valid.
For example, you don't want to process a form that's missing critical information.
Performing validation in server code is a security measure, in case users bypass client-based validation.