Now that you have some idea about data annotation attributes, let's develop a simple ASP.NET MVC application that makes use of these attributes for data validation. NET MVC project and select the Empty project template.Copyright © 2008 The Extensible Markup Language (XML) is a subset of SGML that is completely described in this document.
After the “Edit” button is clicked, a new window will open that allows us to edit the new script: This script also includes a check for an empty string, so that the user can wipe out a wrong string and start from scratch.As I mentioned before, information is passed to the validation function in the event object, and in the code we see that the member ‘value’ is used to communicate the current value of the field.The member ‘rc’ (or return code) is used to communicate back if the validation was successful or not.HTML validators work best for email when you use them to check for syntax errors, unclosed tags, or orphaned tags. HTML validation works by comparing your HTML to a set of standards or rules, called a DOCTYPE.When attempting to validate HTML coded for email with a web validator, it’s pretty common to see errors and warnings that are confusing. DOCTYPE is a document type declaration, and is usually placed at the beginning of your HTML file to tell the validator which set of standards to check your HTML against: In the case of web development, it also tells the browser which rendering mode to use.