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Description: Ensures that the specified property is not null.
Validity checks allow the function to survive at least some forms of improper usage, enabling an application using the function to likewise survive.
The following code example uses the derived class Text Box and validates an e-mail address that the user enters.
If the e-mail address is not in the standard format (containing "@" and "."), the validation fails, an Error Provider icon is displayed, and the event is canceled.
If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets, Mobile OK content, or to find broken links, there are other validators and tools available.
As an alternative you can also try our non-DTD-based validator.
Requiring the caller to validate arguments can result in faster code because the caller may understand certain invariants that prevent invalid values from being passed.