An important aspect of creating Web Forms pages for user input is to be able to check that the information users enter is valid. NET provides a set of validation controls that provide an easy-to-use but powerful way to check for errors and, if necessary, display messages to the user.The following topics tell you more about validation controls and how to use them.Does the color scheme make it difficult to impossible for those with color-deficient vision impairments, or who have trouble discriminating certain color combinations to read the information at the site (examples of problematic text/backgrounds: dark gray on black, yellow on white, red on green)?
Validating web resources
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.
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.
That means they have to meet the "strict" standards set by the W3C Organization and pass a variety of validations for CSS and XHTML. Some only check CSS, others XHTML, and others for accessibility.
If you are sincere in presenting standardized pages to the public, test them with several validators.
You may find that some links that are reported as broken actually do work correctly.
This occurs usually with links using "https:" (instead of formatted URLs which indicates a secure connection is being used.
Shannon Horn is the co-founder and chief software architect of Web Geniuses Corporation ( Hence, many times validation was not performed in a uniform manner, complex validation was difficult to implement, and Web servers were vulnerable to validation scripts being modified by malicious users.