Even if users correctly enter an integer, for example, you might need to make sure that the value falls within a certain range.
Note Important Validating user input is also important for security.
Conforming to standards and regulations is one of the many ways you can make your website universally understood.
Make sure your codes and styles validate across the board.
If a form is long or complex, reporting errors only after the page is submitted can be inconvenient to the user.
You can add support to perform validation in client script.
You might also have certain restrictions on the values.
Validating a website is the process of ensuring that the pages on the website conform to the norms or standards defined by various organizations.
Validation is important, and will ensure that your web pages are interpreted in the same way (the way you want it) by various machines, such as search engines, as well as users and visitors to your webpage.
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.