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Data from all potentially untrusted sources should be subject to input validation, including not only Internet-facing web clients but also backend feeds over extranets, from suppliers, partners, vendors or regulators, each of which may be compromised on their own and start sending malformed data.Input Validation should not be used as the primary method of preventing XSS, SQL Injection and other attacks which are covered in respective cheat sheets but can significantly contribute to reducing their impact if implemented properly.It is always recommended to prevent attacks as early as possible in the processing of the user’s (attacker's) request.Input validation can be used to detect unauthorized input before it is processed by the application.For example, if you use HTML entity encoding on user input before it is sent to a browser, it will prevent most XSS attacks.
You can define validation rules for table fields and for controls on forms.
You can follow along, or create your own data validation scenarios.
Download Excel data validation examples Now, instead of typing your list values in the data validation Source box, you add the name that you just defined, preceded by an Equal (=) sign.
You can use data validation to restrict the type of data or the values that users enter into a cell.
One of the most common data validation uses is to create a drop-down list.