Simple validating c input

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For more information, please see the cheatsheet on Sanitizing HTML Markup with a Library Designed for the Job.

Detailed information on XSS prevention here: OWASP XSS Prevention Cheat Sheet Many websites allow users to upload files, such as a profile picture or more. Many web applications do not treat email addresses correctly due to common misconceptions about what constitutes a valid address.

As a start, there are some simple extension method you can use.

Include the following using statement: // string based extension methods (Is Not Null Or Empty and Is Not Null Or White Space are the only methods that have inverse tests.

Specifically, it is completely valid to have an mailbox address which: At the time of writing, RFC 5321 is the current standard defining SMTP and what constitutes a valid mailbox address.

Please note, email addresses should be considered to be public data.

start date is before end date, price is within expected range).

It is always recommended to prevent attacks as early as possible in the processing of the user’s (attacker's) request.

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It's also free-form text input that highlights the importance of proper context-aware output encoding and quite clearly demonstrates that input validation is not the primary safeguards against Cross-Site Scripting — if your users want to type apostrophe (') or less-than sign ( References: Input validation of free-form Unicode text in Python Developing regular expressions can be complicated, and is well beyond the scope of this cheat sheet.

Input validation should happen as early as possible in the data flow, preferably as soon as the data is received from the external party.

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[1], each of which may be compromised on their own and start sending malformed data.

then the developer should be able to define a very strong validation pattern, usually based on regular expressions, for validating such input.

If the input field comes from a fixed set of options, like a drop down list or radio buttons, then the input needs to match exactly one of the values offered to the user in the first place.

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